How to Test a Low Pressure Fuel Pump
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- เผยแพร่เมื่อ 27 พ.ย. 2024
- This video shows how to test a 2 stroke Yamaha outboards low pressure fuel pump. the low pressure fuel pumps operate using a diaphragm. when this diaphragm goes bad or fails it will leak. this video shows the easy steps to diagnose a bad fuel pump, and with the cost of a new one these days its better to buy a new pump then a diaphragm kit.
Yamaha New Oem FUEL PUMP ASY 6E5-24410-03-00
Yamaha 650-24431-00-00 Gasket Fuel Pump
Thanks for this video. I just brought my first boat back in January 03’ skeeter zx225. Ran it all summer with no problems. I brought it from a dealer but I cleaned the o2 sensor and replaced the thermostats and fuel filter just for piece of mind. But the last two times I had it out while idling it would shut off and not start. So after several attempts to primp it would finally start the run just fine the rest of the trip. So after watching your video I found that all 3 of my pumps would leak when I loosened them and squeezed the primer bulb. So I have them ordered and hopefully it fixes the problem. Thank you again for the video liked and subscribed
@@MrBdogg317 thanks for sub! Glad you found the video helpful. Hope that was it 👍🏽
I did a fairly long list of parts swaps on my 2002 Yamaha VMAX 200 in the last 8 weeks. Thanks to your for helping to guide me with multiple videos on the same engine. I replaced thermostats/gaskets, VST filter/gasket, primary fuel filter/gasket, fuel primer bulb, post primary fuel filter 1 way fuel valve, new oil pump/strainer, new reservoir low oil sensor, engine oil tank sending unit, and usual lower unit oil and water seperator valve. Runs like a DREAM. Cranked immediately on just a tiny bump of the key. On examining all parts swapped I think the thermostats were shot which caused a shut down and my deep dive into this overhaul. Engine 22 years old. Only 300 hours. 2nd rebuild on the water pump on deck and good for another 5 years min in local fresh water. Thanks so much for your replies an assistance!!
That is great news!!! These engines are great and seems like you will take great care for it. May she run for another 20 years! Cheers 🍻
@@ReelTeaseFishingThanks again for all your help and messages. If not for you I would have ended up spending a fortune at a dealer for engine work.
Great information! I have a 2002 Mercury 200 optimax just got rebuilt cranks up fine idles good but once I put it in gear it tends to die off and won’t accelerate. Any suggestions on what I can check thanks 🙏.
Yep. Have the same motor and had issues getting above 3500rpm. Did this test and lower pump poured gas out when the bulb was squeezed.
Thanks for the feed back. This is definitely a common issue on these outboards. 👍🏽
I did I just did this test to my 1995 150 two-stroke the top pump was bad so I’m replacing both. Thank you.
@@robmitchell3633 great find! Hope she runs like a top after 👍🏽
THANK YOU! Very Direct and detailed.... Great stuff!
Hey Carlos, thankyou so much for your video, I have the same symptoms and will give this a try as soon as I'm home.
I have a spare pump to try. It's a honda bf50a
Thanks man subscribed 👌
Awesome! Thank you
Please let me know what you find out. 👍🏽👍🏽
Good tips in this Video, would these cause primer bulbs to go soft ? (Intermittently) I’ve replaced primer bulb and all fuel line between engine and tank/ water separator. After mine quits and hand prime it will run fine for hours/days before this occurs again and engine is starved of fuel. No anti-siphon valve on tank. Fuel vent is free and clear..
A sign of a bad low pressure fuel pump would be the need to pump the bulb while the outboard is running to keep the engine running at full speed. Essentially pumping by hand is taking over the fuel pump.
You may have a slightly failing fuel pump. That’s barely keeping up giving you the intermittent issues.
I have a Yamaha 200 2 stroke and it only starts if I give it gas or put the choke on, a week ago after starting it cold it started all day in one go, now 2 or 3 hours pass and it does the same thing, the motor has no missfire
I have a Yamaha F150 LB currently it’s making oil. When I pull the dipstick out, oil gushes out. Oil smells of gas. I will check this tomorrow. This was my thought that I had a bad fuel pump leaking into the crank case.
That could possibly be it.
Usually it’s one of three things.
1. Thermostats are stuck open
2. Leaking fuel pumps
3. Your rings are not seated.
@@ReelTeaseFishing it was one of the low pressure fuel pumps with a ruptured diaphragm. Drain oil, changed oil filter and replaced fuel pump and is working great.
@@fldallyb awesome! Glad to hear 🤙🏽
I have a 90 horse Yamaha four-cylinder 1985 model I recently changed the power pack and I've had it 2 to Marine mechanics without fixing my issue. Boat seems to run good at high speed but stalls at trolling speed. Carbs have been clean bowl reset. Sometimes at full throttle you can hear it bogging down and the boat goes slow and then something will suddenly change and it picks up and runs great. Also sometimes when I sit in fish even after the engine is warm I have trouble restarting the motor
Have you changed the fuel hoses. They overtime collapse inside restricting fuel.
Another thing to look at will be your fue bulb. They have one way valves that when they go bad get stuck restricting flow.
Best way to diagnose this would be to run fresh fuel off an external tank. Buy new fuel hose and new bulb. Put it direct to engine and see how it runs. If it runs good you know the issue is from the fuel line back to the tank.
I’d start with that. Then we can look into more difficult things to diagnose but do that and let me know how it goes
@@ReelTeaseFishing thank you, that line and bulb has been replaced but I will check fuel pump etc. Timing has been check to be okay but it just seems like it has some kind of short or something by the way it bogs down sometimes and then sometimes something seems to change immediately and it starts running fine without any change to the wot
@poolsj1 that's exactly what my yamaha 40 is doing. Did you find the fix?
I have a 40hp johnson with a similar problem the motor won't start until I bypass the choke solenoid and the motor Boggs down at wide open throttle. After 15-30 minutes while still warm it won't start.
@@walterwulff8973 are you eliminating the choke or engaging the choke for it to run?
Wow nice way to explain how to check pump easily. Hey from New Zealand by the way, I have a 220hp Yammy and Haines boat from 1989.
@@darrenmillar2201 thank you for the kind words, glad you found it helpful!
Have always wanted to visit New Zealand!! 🤙🏽
@@ReelTeaseFishing please do! really amazing place to explore, heaps of lakes for boats and islands to explore.
@@darrenmillar2201 SOUNDS AMAZING!!
Thank you so much for making this vid! You just saved me from buying all new low pressure pumps. I’m still troubleshooting but I think this will help. I’ve got a Yamaha 140 salt series 2 stroke that bogs out after about 10-15 seconds of wot. Carbs are squeaky clean. Gonna change fuel hoses and check low pressure pumps.
So glad it helped you out. 👍🏽
Mines bogging down in and out after wot, cleaned the carbs new fuel lines, fuel pick up tube is clean no cracks, all connections are air tight. I have no clue what else to do but I’ll try this
Hello, so what was ur solution, I have same issue ??? Fuel hoses ? Or bad low pressure pumps ??
@@dzmarinemechanics3238 fuel pump🫡
@@dzmarinemechanics3238 pulled one off my other motor and works fine now
2003 Nissan 120 two stroke. The throttle control doesn’t throttle up until it’s almost all the way down and it’s super tight when about full throttle. Keeps hitting dead spots at full throttle as well
When was the last time you replaced your throttle cables?
Over time they tend to corrode and stretch out. This will cause your symptoms
Great Job Brother, thanks for the help and tips. Keep It Up!
@@lokomoto87 thank you!!! Glad it helped 👍🏽
Hola .. mi Motor funciona perfectamente, pero cuando descansa un par de horas, la pera (bulb) de la manguera pierde presión y tengo que bombear para que vuelva a encender, sería esa bomba que enseñas en el video la que me está dando el problema? Es un Yamaha 25 enduro dos tiempos, saludos y gracias!
Good video man, never worked on a Yamaha but I'm guessing this means there's a hole in the diaphragm? Or is there check valves in those pumps?
Thank you sir, these pumps work on only vacuum. when they leak like this it means there's a tear/rip in the diaphragm. very common when using ethanol laced fuels.
Hi there, thanks for the video. I have a 130hp yamaha saltwater series 2 stroke. It won't start, coughs a bit in the choke like its going to but won't fire. Have changed plugs, made sure i have new fuel, choke is definitely turning on, fuel is getting to the bowel. Have tested the low pressure pump as per your video but no signs of a leak. Could it still be the low pressure pump as there's not many more options?
If it’s a carbed model I would clean them and rebuild them. Especially if the engine has sat for a few months
my dear friend . My engine is like your engine, everything is fine but it doesn't work. Can you tell me how you found the solution?
Just tried this on my 78 25 hp evinrude that is having trouble delivering power when throttle is applied, cracked those 2 screw lose and gas leaked everywhere time to order one
What is the best way to winterize your boat motor. Would you recommend a ball valve to shut fuel off and let the carbs run out of fuel or what do you recommend
Before this, run the engine on a mix of antifreeze. Therefore if any water remains in your heads it won’t freeze and cause issues. Run outboard on a fuel additive. Then
If you have carbs, the carbs themselves have a brass drain screw located on the bowl. Remove it. Drain the fuel put screw back on. I’d also spray the engine with fogging oil by removing spark plugs and spraying the cylinders. Turn engine over for a sec or two to lubricate the entire cylinder. Add spark plugs back.
Change your lower unit oil with fresh oil. Any water in your LU can crack your LU or bust seals during winter.
Same goes for the motor if it’s a 4stroke.
Great info on the low pressure fuel pump. I am wondering if mine are bad, I think I have two of them. I have a 2003 200hp Yamaha HPDI outboard motor. It starts right up and revs no problem but in the water when I put it in gear it will not get up on plane, I can idle in gear and move around but I can't accelerate. Any suggestions are greatly appreciated.
Ahh the HPDI. I’ve gone through this with my own HPDI. I recommend changing your neutral safety switch. It’s located by the control cables on the outboard. Look for a blue plug connected to a small switch that I believe is held by a single screw.
Keep in mind HPDI are extremely picky about clean fuel. If this doesn’t cure it you may need to go through & clean your entire fuel system. Filters, Mystery Filters & injectors
Thanks for your response, I'm thinking more fuel related. I bought the boat this summer. It had sat for 3 years. I found water in the gas tank, drained the tank and repaired, added a water/fuel separator filter and changed the first in line filter. It ran great. I towed a broke down boat to a marina (45 min tow) at very low speed. Since then it will not get up on plane. Starts and idles great but won't accelerate.
@@kevinharding2036
If she sat for a period of time I’d def look in changing the VST filter, the high pressure fuel filter (silver canister after the VST)
If that doesn’t do it then do the mystery filters and send Injectors to flagship Marine (one of the only places that does high pressure injectors )
@@kevinharding2036 look through my videos, I have a few on the HPDI’s fuel system service
@@ReelTeaseFishing ok thanks, I have seen some of your other videos on the HPDI fuel system, I might give that a try. I am in the north east and it is cold here now. Might be awhile until I can get to it. Thanks again
Great video. I had an issue this past weeekend.
Yamaha 50hp 2 stroke wouldn't go past 4k rpm at WOT.
But after about 25 mins of leaving it at WOT it just goes 6k +rpm out of no where, back to it's expected operation.
A few minutes later i went over a small wave then it immediately went back to not going over 4k rpm. I can't seem to figure it out
You have a fuel restriction. I’d be looking at fuel filters, fuel lines, fuel pump. Also pull some fuel out of your tank into a mason jar and look for signs of water or contaminants.
@ReelTeaseFishing I'll try the list of things you've suggested. I appreciate your helpful response.
@ReelTeaseFishing just got off work and started to work on the boat. As soon as I loosened the bolts just a little on the fuel pump, gas started dripping out the pump. Gonna purchase a replacement pump then test again on the water. Thanks a lot.
@ReelTeaseFishing This update is mainly for the people who dig through comments to find answers to similar issues they are experiencing with their outboard. I put the replacement pump in then took the boat out on the water. The boat now goes full throttle and gets up on plain. It's running great! Thanks again.
@@dijoncameron8567 thank you for coming back and leaving an update. Comments like this that close the loop help those that may be experiencing the same or similar issue
ok, i got one for you. last time out we were coming back to the launch and lost half power or actually down to 8 to 10 mph. just about wake speed. I haven't tried to figure it out yet but was able to run the motor at home with fresh water and then winterize it for last year. Any idea what would cause this. I did rebuild the fuel pump a few years ago and for fun tested everything on the motor doing my own videos. one thing that i have neglected is putting a new fuel filter on. I drain all the fuel out of the main tank and used it in the car so it's empty currently. I have an auxiliary tank to put non-ethanol fuel in to test it but not at full rpm. will have to take it to the lake to run it and probably next year.
2005 VMAX 200 hp. Engine starts great even cold. Run a few places then it doesn't start. I waited about 30 minutes then it started. Once running lake it just shut down. Then again hard to start. Any recommendations.
Thank you
Great info. I have a 2016 F150 that sputters at rpm over 4000. Runs perfect below 4000. 250 hours. I change in-line and onboard filter ever spring. What was also confusing I had my wife take the wheel while it was sputtering and I tried pumping the primer bulb. It was hard as a rock. Maybe the bulb? Any advice?
The bulb should be pretty hard, however check to see if it remains hard say a week after using the boat. if it's still rock hard. the bulb may be bad and the rubber has lost its elasticity.
Usually issues at high RPM are caused by fuel restriction. Filters changed are easy to do. Also have you checked to see if there is water in the fuel? When you pump gas can you feel the fuel vent pushing air out rapidly?
just trying to check off the easy things before diving into the engine & parts.
After all this I would then recommend using an external fuel tank to run the engine to rule out the possibility of a stuck one way valve on the pickup, a dirty/clogged screen in the pickup, bad gas, contaminated fuel, vent issue etc. if she runs great on the external you will no where to focus on next. If it still runs poorly you can now focus on the engine itself.
You’re my hero
Wooohoooo
Appreciate this video as I am trying to diagnose an issue I am having with a 1996 Mercury 200 EFI. Engine starts great, smooth idle. no stall or sputters. Temp is normal and boat hits 58009-6000 RPS at WOT and hits 70 mph. The issue is that it takes 3-5 attempts to get it up on plane. I have ran the Same prop (with prop plugs) and pitch since I bought it new. I have changed the primer bulb and main fuel line from the tank to the engine. I have the changed the main fuel filter and the impeller, and the ECU. Any suggestions for what be the cause of the struggle to get up on plane?
My guess is a fuel restriction somewhere.
Take a sample of your fuel from tank. Make sure it’s clean, clear and no water.
I’d then do a compression check even though it’s still getting up in RPM.
Then id go down this list of things
1. Get rid of any and all gray fuel lines on the engine.
2. Does your fuel pickup tube have a screen at the bottom? Can be partially clogged
3. Does your tank have a spring loaded check valve on the fuel fitting? Notorious for issues
4. Clean VST?
5. Lastly I’d send injectors out for servicing once all has been cleaned and checked.
Not sure if this model has an electric choke, but I’ve seen these symptoms on a stuck choke in the choke position.
@@ReelTeaseFishing Thanks for all the detail here. I will run through this list to see If I can find anything obvious that you referenced, and let you know what I discover. Appreciate the suggestions.
@@billjones1446 yes sir!
The only other thing I can think was to check for consistent spark on all your cylinders. It may be an intermittent spark issue almost mimicking a fuel issue. Coils, stator/trigger will cause these. Best of luck. Let us know what you find
2 stoke 50 hp Merc. Run with bump at full, chokes at slow speeds and idle. Continually pushing the key/choke? manually fueling carbs got me back to the dock. Is this a symptom of bad fuel pump? I am handy but not a pro mechanic. I have changed hoses everywhere no air ??? New sparks. I am quickly running out of options. Am I on the right track? Thanks for the share dude it helped me in this situation.
Immediately this is telling me you have a fuel restriction issue or air fuel ratio is off.
Is this a carburetor engine?
👍 yes
@@wyregrasser7540
Definitely check your fuel. If it’s older than a year old, I’d remove all fuel and put new fuel. That will eliminate the possibility of stale/old fuel. Also helps eliminate contamination on fuel as an issue.
Secondly all fuel filters should be changed out for new. (Seasonal maintenance anyways, so not an added expense)
I’d do a carb overhaul. Pretty simple if you buy the OEM carb kits and soak the carbs over night and use compressed air.
Lastly I’d perform a link&sync on the outboard once the overhauled carbs are installed.
This is all capable if you are somewhat mechanically handy. Will save you some money as well vs a shop.
Some good carb overhauls and link&sync videos on TH-cam. Go slow. Take photos to go back if you need to reference when putting it all back together.
@@ReelTeaseFishing I really appreciate your time, response and advice. Thanks tons!
@@wyregrasser7540 best of luck! Let us know if this fixes it or you find the issue
What up, it’s Concepcion. My carbureted 2 stroke Johnson isn’t going passed 3k, going to give this technique a try.
I have a 2004 mercury Optimax 200. Worked good last year, when winter was done took it out on the water has kind of a hard time starting at idle or in gear with little pressure. It’s sputters, the motor shakes after about 10 seconds. It will shut off go to start it again. It starts right up but it’ll sputter right away. The faster speeds it seems ok. What do you think?
These engines are fuel injected. If after storing the issue began I’d look into dirty filters, dirty injectors, possible dirty fuel, water in fuel from sitting etc.
Thank you May friend, you helped me a lot!
Having the same issue. Had a start and stumble. Then, it started rough and then normalized. It runs fine at 3500rpm but once I throttle up, it falls off, and my starboard engine overpowers the port side and makes it pull hard left. I'll check that next and see if I have that issue.
Get back to us with your findings
@@ReelTeaseFishingboss can i ask what is the issue. Of my 40 hp mercury four stroke. If engaged the geR. Engine will cur off.. what qS the issue. Thanks
@@retpekp6624 its hard to say what the issue is, I don't have enough information but Id would look into things like fuel. is it fresh? do you have any fuel restrictions? kinked fuel hose, clogged filters, fuel bulb working correctly? water in the fuel. Then work your way into the engine. most of the time its fuel related issues.
Thank you! I had two bad ones.
Thank you, tomorrow I’m going to try mine.
Hey. Thank you for these videos. I have a v- max 115 yamaha where it runs for about 15 or 20 minutes then sputters an cuts off. I pump the ball then try to start it and it starts but when I put it in gear it sputters and stops. My mechanic has told me the pressure is good. But it just seems to be running out of gas between the ball and the engine. Any suggestions?
I’d put clean filters if you have any fuel/water spin on filters. I’d also look into the possibility of a bad bulb (they have check valves in them that go bad) and look into the possibility of a collapsing fuel line. If it is not the black USCG fuel hose there’s a big chance your fuel hose is collapsing inside the hose. Can’t tell on the outside
Have a 2014 f70a and it will run fine for a while and then just die and never run again. Each time i start it, it fires and then immediately dies. The primer bulb is soft but you can hear gas moving in it. Using this trick the gas comes out of the screw hole around the loosened screw. Hoping replacing this works out
Could be, if fuel is leaking from the LP pumps it spills it directly into the engine bypassing injectors etc.
Usually this causes too much fuel and it floods the engine.
Hoping you found it and replacing the LP fixes it
@@ReelTeaseFishing ahh got it. Well yea it was definitely leaking fuel from that pump. Getting a new one pronto. Thanks 👍
@@ReelTeaseFishing Replaced that pump and my boat is running great. Thank you 🙏
@@alexhodgkin2589 oh man! So glad to hear it 👍🏽
Thank you for watching and getting back to us with the great news
Many thanks for sharing your knowledge!!
Thank you for watching, appreciate you taking the time to leave a positive comment 👍🏽
@reelteasefishing My Yamaha VX225 starts and idles fine. It revs fine on the hose, but won't rev past 3200 rpm under load in the water in forward, but will rev fine in reverse. Do you think the fuel pumps might be the issue? Thanks for the great videos and information.
Sounds like it has lack of power under load. Definitely could be bad fuel pumps maybe even pumps that are just starting to fail. However I’d highly recommend to look into cleaning your VST filters and any in-line/spin on filters in your fuel system.
@@ReelTeaseFishing Thanks for the quick response! It's the carbed model, do they have a VST? I've already cleaned the filters.
@@haywirefarm carbed model makes it easier, I’d definitely redo the carbs. Ultrasonic cleaning if available.
I have a 2013 F150LA. Starts and runs for a minute or so, then sputters out like it's starving for fuel. Checked water separator, and fuel filter, both were good. Then checked the oil and it's almost spilling out of the dipstick. I called a local outboard mechanic and he said test the fuel pumps for pressure, but he would bet that's the problem. Do you agree? And is this the same method I would use to test? On the diagrams, my fuel pumps look a little different than these(Part number 63P-24410-10-00). Mine look like a part of the fuel pump body goes into the block with an o-ring. Are you familiar with that? I subscribed to you btw - great channel!
@@markmcmanus5901 thank you for subscribing. Your pump is slightly different and works almost in the same manner. However, what you are describing sounds like it has failed. You can test it the exact same way. Pull it off the block and squeeze primer bulb. These don’t always leak when they fail but in your case it sounds like it’s dumping fuel into your block. (Blown out internal seal)
I highly recommend you buy a new pump with the oring/seal to the block and change your motor oil as fuel in the block will thin out your oil.
You should be back in the water in no time 👍🏽👍🏽
I have a 2003 saltwater series II 200HP boat was sitting for 15 years no fuel is getting sucked in all lines have been replaced what can it be the fuel pumps on the motor I have two that look like the one you just showed one on bottom one on top
I would start with an external tank with clean fuel and hook up your new hoses and new bulb to that tank.
Could be a bunch of things.
Pickup tube in your tank could be clogged or broken off, one way valve on tank fitting could be stuck in closed position. Vent from tank could be clogged,
By going to a new external tank with new hoses we can eliminate that as a problem.
I have a 2011 yamaha 115 it’ll turn on and run fine but after starting it a couple of times. It won’t start you’ll hear it trying to start but nothing happens. So I pump the ball and after a while it’ll turn over. Do you have any idea what is causing my issue
Issues starting when the engine is warm leads me to believe you may have a faulty injector. Possibly leaking when off flooding a cylinder.
I’d have them (4) in you 115hp serviced and cleaned.
That’s what I’d look into
@@ReelTeaseFishing I’ll look into it thank you for your opinion
Does this Carry over onto a Honda fuel pump?
My 50 ho mercury 4 stroke will run on starting fluid, will not run??? Thanks
Start off by replacing your spin on filters. If you have a water separator on the boat before the engine, go ahead and replace with a new filter. Then replace the small filter that’s in-line usually under the cowling with a new one. See if that changes anything
If it’s a carbed model I would look at overhauling and cleaning out your carbs. If it’s fuel injected I’d look into having your fuel system and injectors serviced.
It definitely seems to be fuel related as it runs on the starting fluid.
Definitely make sure and rule out water in your fuel
I am having the same problem
I have a Suzuki df 70,,my low pressure fuel pump is cam driven,that pumps the gas into high pressure pump in the vst ,,isn't it sort of the same test for this one,,unbolt it out of the hole,,pump the bulb and check for leaks ,in this case it would be leaking gas into cam shaft,not good
I have a 2014 etec 90 hp. Starts right up and runs good. After running 15 minutes to my fishing spot, i turn off the engine. Each subsequent start, the boat starts fine. But it stalls when i try to put it in gear. I linked it through the end of last season by giving it a shot of fuel in neutral. Then it would run fine after a tiny stumble. Now it stalls even when i try to give it gas in neutral. 3 or 4 times of trying to give it gas in neutral, the engine will rev up. Then i can once again put it in gear and the boat runs. Do you think that would be a fuel pump issue or an injector issue?? And i assume you backed out the two mounting screws in this vid
a failed pump will give you the results you are having. a clogged or collapsed fuel line will as well. Id check your filters, fuel lines, inline one way valves ( on primer bulb and on some fuel tanks.)
@@ReelTeaseFishing Thanks for the reply. I ran the motor on a brand new fuel line to a 5 gallon gas can and it still did the same thing. So i believe my fuel system is good. I just rebuilt my mechanical fuel pump and I'll have it back out on the water this weekend. Keeping my fingers crossed
@@stevewolfe6708 good luck! Hope you got it 👍🏽
I have same engine mines at wot it boggs down but does not shut off I let off of throttle then it will pick back up and feels sluggish I am going to test the pumps like in video also someone told me could be fuel pressure regulator would that cause the engine to run sluggish?
Filters, pick up tube in tank, collapsing fuel lines or fuel bulb, bad low pressure pumps, water in fuel
All can cause sluggish results at WOT
Thanks I appreciate that information that you have given to me
Work on verado 300?
Hey Carlos I have a 2003 Yamaha 150 v max. I have 2 fuel pumps 1 you said is the low pressure fuel pump, is the other one a high pressure fuel pump or how do they work. The motor just cranks but does not run. I think it the carbs. When I first went to start it sound like it was going to run , but now just cranks. I think it was old fuel so I am thinking of taking the carbs out and cleaning them and I cleaned out the old fuel from tank. On the carbs, clan I just open them and clean them or do I have to get a rebuild kit for each one.
Just looked at your fuel pump video sorry brotha.
These style pumps will be low pressure fuel pumps. Then inside the VST is a medium pressure electrical fuel pump.
The high pressure fuel pumps are are not on all outboards. Usually on the fuel injected models. If yours is carbed I don’t believe you have one.
As far as the carbs. Yes a rebuild kit will be needed and highly recommended. Go OEM for the kits as many of the knockoff kits have sub par parts with really bad gaskets and orings that will lead to fuel leaks.
If the fuel was bad look into replacing VST filters too
@@ReelTeaseFishing do you have carburetor rebuild video
Thank you
I have a Yamaha vmax 150 2007 2 stroke. The first start of the day (cold start) is rough. Even with choke it doesn’t want to turn over. I wait 10mins after and it fires up. Good for rest of the day. Any suggestions on the first start of the day? Much appreciated!
Have you tried cycling the key for the first start?
Basically turn power switch on then you’d prime the bulb. Go to the key and turn key to on position (not start just turn to on) leave in the position for 10seconds
Turn key to off position then back to on for 10 seconds then turn key over to start.
This helps the engine cycle and prime the fuel system, injectors etc.
@@ReelTeaseFishing I have not tried that. I will for sure give that a try this weekend! This past weekend I did replace the fuel filter and when I primed the bulb after, I noticed a little gas coming out of the small hole in the front of the low pressure fuel pump. In the video you mentioned it shouldn't be coming out of the back, but what if it came out a little in the front hole?
@@fit_with_matt these pumps are suppose to be completely sealed. Any leakage is a failed pump. That may very well be it. Good catch.
not only is it leaking but more than likely allowing air into the system. no bueno
@@ReelTeaseFishingBro thank you so much! Replaced both fuel pumps, did your starting procedure and boom! She fires right up. This was amazing!!!
@@fit_with_matt awesome!!! Glad to hear that. Happy Holidays Matt 🤙🏽
I have a C90 Yamaha stroke. Last time out started running rough, lumpy at idle speed and now won't go over 3500 rpm. Same proceedure as in you video?
if its a two stroke model than yes sir, if its the four stroke there may be a different fuel pump. if it uses the pump that looks like this one its the same procedure. if it looks different, that model may dump the fuel into your crank. Check your oil by smelling it. if it smells like gasoline you have a failed fuel pump.
@@ReelTeaseFishing pulled it off, it dripped a little bit. 2 stroke BTW
@@markdimaio8396 should be completely leak free
Have a Yamaha 300 HPDI only problem I am having is when I start to plane runs good all the sudden, it starts to bog down like it’s losing fuel any recommendations
HPDI are dependent on clean fuel. They have many filters in the fuel system.
I’d suspect low pressure pumps,
Your VST filter or pump
Definitely fuel restriction somewhere
@ReelTeaseFishing, I have Yamaha OX66 225hp which is currently leaking fuel out for the lower unit. I have change the fuel injectors and all 6 sparks plugs, what do you think this could be. thanks
Take the cowling off your outboard.Turn on the power to the boat. Then Manually pump your primer bulb and turn the key to the on position but don’t crank the engine. Start looking for leaks or spurts of fuel. Follow all the fuel lines, all the areas the fuel flow to. Don’t see anything?
Pull off the air box/silencer (we have a video that shows how on our channel) continue to look for leaking fuel on all hoses and now from the carbs. Still nothing? Have a friend pump the primer continuously while you go through the engine again looking for fuel spilling.
My bet is a cracked fuel line and fuel dripping down the cowling and down the shaft out your lower unit.
@@ReelTeaseFishing checked all fuel lines no leak, this happens when running the motor, I believe its the LP pump which I'm gonna replace next week.
Hey my ox66 surges when I’m throttling it. Rpm goes up and cuts out then kicks back in. It starts and idles fine. I replaced high pressure pump, clean injectors, new plugs, I even ran it off a 5 gallon can to eliminate fuel tank and I’m still having the same problem. I used an inline glass spark tester while engine running to watch each plug fire at a time and neither stop firing at any time. I was thinking it was the neutral safety switch but all are firing. Could it be the oxygen sensor? Could it be the stator is still bad?
If it has an oxygen sensor I’d highly recommend cleaning it out. Also recommend doing your VST filter if it’s fuel injected. Let me know after you do this if it’s still giving you the same problem.
Ps. Check to make sure you don’t have any air leaking into the fuel system via old gas hoses, loose clamps/fittings or orings on the fuel filter. When you open VST you need the kit to replace orings/seals. Air will cause surging
@@ReelTeaseFishing rebuild vst, all new fuel hoses and clamps. I’ll check the oxygen sensor
So are you saying it should be a steady stream of gas?
Zero gas should come out the rear of the pump. Fuel only travels to the hoses. It works on vacuume from the area it attaches to the engine block so it is not as steady as a mechanical pump. They are low pressure too.
I just put a new fuel pump on my 7.5 evinrude. When I squeeze the primer, it squirts from the weep hole, on the pump. No fuel coming out the outlet??
@@brandonhaley-z8j are you sure you put it in the correct orientation?
@@ReelTeaseFishing I found the problem, bad diaphragm, out of the box. Thanks for the response.
Hey Carlos, I have a Yamaha ox66 225 2 stroke and the only problem I've been having repeatedly is surging. It keeps speeding up and slowing down. Any ideas? Thanks..
Is it carbs or injectors?
I would highly suggest you look into your VST. It’s not a hard overhaul. Buy the kit with new filter and housing O-Ring. Should take about an hour or two to do yourself.
Secondly if you have an O2 sensor, I’d look into cleaning it as well.
Ok, thanks, I appreciate it..
Would a bad field pump make my prime and bulb go soft when it runs
Primer bulb going soft or collapsing can be a fuel restriction towards the tank, a bald primer bulb, fuel line collapsing within itself, fuel tank vent clogged, pickup tube clogged.
Boat turned off at lake and doesn’t turn back on . I did this no fuel leaking . Can it be the internal fuel pump 115 Yamaha 4 stroke ‘2015
Is the throttle in Neutral, is the kill switch on? Do you have fuel. Sounds dumb but easily overlooked.
Can the fuel pump turn it on and still keep it running? Under load it turns off df140 2003...i just ordered a fuel filter for it
Can def be a symptom.
These pumps are not electrical in any way. They just work on vacuum
@@ReelTeaseFishing o ok. With the ear muffs it works, spins the prop fast in gear but under load it cant. It sputters and dies. I cant even get it off the dock
@@finecrazygunz sounds like your issue is lack of power. Could be fuel restriction, could be voltage issue,
Is this fuel injected?
@@ReelTeaseFishing yea 2003 sazuki df140 4 stroke
@@finecrazygunz if you have changed all the filters. I’d really look into your fuel. Rule out dirty fuel or water in fuel. Once that is not a factor I’d move to clean your fuel injectors. Don’t do injectors until you know the fuel is good or you will just dirty the injectors again.
Hey Carlos I have a 200 HP 03 Saltwater series II 200 HP I am not getting any fuel sucked up into the motor it’s been sitting for 15 years what do you think it could be ? I have e two of those fuel pumps you showed one on top on on bottom .
Joel not sure if you sent me the same message from a different account but I’d highly recommend putting the new fuel line into an external tank with clean fuel prime the bulb and see if that changes anything. If you start getting fuel to the engine then we know the issue is at the tank on the boat.
@@ReelTeaseFishing I did that no dice still not getting fuel to the engine could it be both pumps ?
@@joelreyes6517 when you say fuel is not getting to the engine where is it not getting.
You have a small fuel filter (bowl) before your pumps. Is gas getting there?
Is it carbed or fuel injected?
@@joelreyes6517 it won’t hurt to do the test as shown in the video. If they are leaking a lot it can definitely be your problem.
@@ReelTeaseFishing it’s not making it to that filter before the the pumps . It’s fuel injected
my mariner (yamaha) wont idle, but will run fine at medium-full throttle. this started one day while i was fishing and my engine was idling and suddenly died. i havent changed the pump in the 5 years i owned the engine so will try
if its a carbed model ( carburetor ) If highly suggest you do a carb overhaul. full clean out and new seals/gaskets.
@@ReelTeaseFishing first thing i did, gasket, seals, cleaning and tuning
So helpful
Glad this helped
Thanks
I have a evinrude 150hp not getting fuel but I do have spark, any tips.
Depends what year and model but they do have a diaphragm fuel pump that tends to go bad. I’d look into that possibility.
Then I’d start from the fuel tank to the engine check for leaks in the fuel hose. Signs of dry rot in your fuel hose can compromise the whole system as it allows air into it. check fuel bulb that it gets hard when pumped. Swap fuel filters for new ones. Lastly I’d overhaul carbs if it’s a carbed model
1995 Yamaha 130 2 stroke. Bogging under load.. around 1500-2000k rpm. If you power thru the bog she will run wfo 5600 rpm’s with a slight miss you can hear. All plugs look the same.. new plugs new after market coil packs. 4 micron water fuel separator and a 10 micron after that and the factory water fuel separator on engine.. boat had 98 hours on it when I got it from my uncle January 2023 and now has 250.
Could this be a fuel pump issue?
I only run non ethanol fuel. It’s oil injected still.
Definitely can be a failing pump. Have you also considered completely rebuilding your carbs?
@@ReelTeaseFishing that’s the next step. But the carbs were rebuilt and cleaned and sync about 3 months before I got it from my uncle original owner. Iv had it for a year and it only sits during the week. I’m assuming it’s the original fuel pump. He said he’s never changed it.
I’m going to unbolt it test the pump in the am. I know the compression is 125 in all 4.
This problem has just recently started..
@@ReelTeaseFishing you have a video of you doing a complete rebuild on the 115/130 carbs
@@hunterherrera7863 I do not have a video but Yamaha carbs are all pretty straightforward. There are some good videos on TH-cam of similar carbs being redone. Buy an OEM kit if you do it.
@@ReelTeaseFishing always OEM. On a car I’ll do after market. But the water heck no. 30 miles off shore is a long way to swim home. I might have did my self dirty when I bought some after market coils. So the wife is grabbing me a timing light as we speak and I’m swapping back to my good old coil. Making sure the idle timing is right.
And testing the fuel pump making sure it’s not leaking the the vacuum hole. I have more smoke than normal. And that one sign.
If I have to pull the carbs well then guess I’ll pull clean rebuild adjust and sync
Thanks for info ❤
Thanks for watching 👍🏽
Every 3 years? I've got 4.5 yrs on the ones on my '96 225. There's a hot rod machine shop that makes blank off plates for them, at least for the OX-66 versions and then you use an automotive fuel pump mounted off engine.
Just stating what the manual states as their maintenance routine for these pumps.
It’s not uncommon for them to last longer, but it is common for them to break down
@@ReelTeaseFishing Thankfully I have new ones in the parts bin. Guess I better swap them out before I get stranded. Until I watched your video I had no idea they were a short lived part. I've read that OX-66 owners have issues with them. Maybe the carb'd saltwater series doesn't stress them as hard?
Hey man i got a 1998 yamaha 130 v 2 stroke and i have change the pump, rebuild carbs , change gas , filters but still everytime i turn it on , runs for 1 min then turns off
Change the spark plugs? They tend to get fouled easily.
Also what’s it idling at? If the idle is set too low she will struggle to stay on. The sweet spot is like 700rpms in the water. About 1k rpms on the hose
How would I know what year my yahmi 200 etxp 6g6 755714 is from. It's on a 81 G.W 24 offshore.
My thinking without seeing the actual plate is that is a 25” shaft 1991 outboard
@ReelTeaseFishing...yes its a 25 inch shift port side of the outboard name plate top left on the plate says 200.topright extp.bottom left 6g6 bottom right 7557 14.so if it's a 1991 I really thank you for that info
@@nwrx247 I believe it to be 1991 according to that info you provided
Can these go bad without leaking externally?
My '06 yama150txr started & idled perfect after sitting 2 years (cancer sucks lol). Tied to dock and shut it off. Never ran again. It'll run on starting fluid, and one single time it actually started on starter fluid and then idled perfectly on its own fuel for about 30 seconds before I shut it off. I tried starting again, and it won't run without starting fluid. I'm not exactly sure where to go from here. Is there any other way of testing them, or does it sound like another issue altogether?
Is the gas you are using fresh?
Sitting for two years I’d replace everything from the fuel lines to the motor. That includes bulb and spin on fuel filters.. I’d definitely also get the tank pumped and put clean fuel.
You can try this using an external tank with fresh fuel and new lines as an alternative for now.
I’d also highly suggest if a carb model, redoing your carbs using OEM carb kits. If it’s fuel injected you may want to look into your injectors and Definitely clean the VST tank.
Glad to hear you are back out there getting it done! ❤️
@@ReelTeaseFishingI do have one more quick question. I still need to find the location of the electric pump, but is the electric pump the that brings fuel to the engine, or is it one of the others?
@@jeeplove_8831 ok if my memory is correct this is a 2 stroke carbed outboard. Your fuel pumps which is two of them should look like the one in the video. It is your only fuel pump and it’s not electric but works on a vacuum created by the engine where it is mounted. (They are notorious for going bad) my suggestion is replace them now regardless so that you know you have to new fuel pumps. Yamaha says these are a 3 year service item. Buy only OEM Yamaha pumps avoid Amazon and eBay as they sell plenty of fakes.
The only other “fuel pump” would be your hand pump fuel bulb that is on your fuel line before the outboard.
@@ReelTeaseFishing yeah, the symptoms of what I'm describing would make sense if it was carbureted with a lift pump or whatever primes it gone bad, but it's a 2006 Yamaha 150 four-stroke, it has a 4 fuel injectors on the rail. It has a low pressure pump that looks exactly like the one in the video, but the fuse box cover on the engine says it has an electric fuel pump as well. I checked the fuse but it was good, so I was going to try to locate and test it with a power probe this weekend.
It's just really weird. I was actually going to mention earlier that it acted just like the Venturi effect on a carb but is fuel injected so it didn't make sense to me. Maybe one of the pumps is intermittently working.
Need your help…
This is a copy and paste message I wrote in an outboard forums.
Just bought my first boat and owner said it sat for 6 years. its a 2000 mercury 90hp engine outboard. Before selling he took it to a mechanic who cleaned out the carbs and pistons. The mechanic thought he cleaned out the gas tank to empty but accidentally left 10 gallons in there, I filled up the rest so 20 gallons were in the gas tank. there was still 10 gallons with 6 year old gas. I ran the boat for 1 day on the water using my big motor for about 30 minutes before switching to my kicker. I then flushed out the gas and cleaned out the tank and put new gas...
With the OLD GAS at full throttle my RPM's were at 3,200 @ 25 MPH. it would run for about a solid 30 seconds then start dropping to 3,000 and back up to 3,200 RPMs. This would repeat forever untill I drop RPMS a bit to under 3,000 RPMs and the issue stopped.
With the NEW GAS it runs at 4,000 RPMS @ 30 MPH and after about a solid 30 seconds starts doing the same exact issue. Drops to 3,800 or so and back up. It will do this until i drop the speed.
I cannot attach the video but I do not think this is a issue with Old gas causing the CARB to be clogged because Right when i got on the water it started doing it. and if the person cleaned out the carbs or other stuff it wouldnt be consistant. What else can i check without spending hundreds of dollars on a mechanic!
PLEASE HELP!!!
I checked spark plugs, gas line, ignition coil, everything’s good. I unscrewed fuel pump and it looks good but how do I know if it’s bad?
Ok here’s my advice. I wouldn’t go off what they told you was done.
I’d overhaul the carbs with carb kits. Clean then and then you know 100% that’s done.
I’d also replace all the fuel filters. If old gas ran through em replace them.
New fuel lines as they could collapse internally if they are old and sat for a while. New fuel primer bulb too
Also some fuel pickup tubes on the fuel tank have a screen at the bottom that gets clogged up. I’d double check that and make sure that’s not the case here.
If you do all that and still have issues then we can look directly at the engine and try to diagnose it some more. .
2002 mercury 225 efi motor at wot only goes 7 knots
I. Have a 125 mercury 1985 and I am having trouble with starting no gasoline in the carburetors! I don’t know what to doo
Is your kill switch inplace?
I really don’t know I’m new to this stuff?
Ok so very basic, two features on an outboard that will not allow it to start. Usually it cuts the spark to the spark plugs but it may cut fuel to the pumps as well.
You have a killswitch, usually a red lanyard to a button. Make sure that’s installed.
Secondly the throttle needs to be positioned in neutral for the engine to crank over.
For fuel, there’s a bulb in-line sonewhere between the tank and the motor. Hand pump it till it gets hard. That is necessary everytime you go to start the engine at the beginning of a trip.
Let me know if that helped
We can continue troubleshooting if not
Greetings my dear friend.. There is a 50 hp thatsu engine. 3 injectors are intact, the brain is intact, the fuel pump is working... but I think there is no fuel reaching the pistons. It works when I spray brake lining spray inside. I am a mechanical technician myself. Apart from the 3 injectors of the engine, there are also injectors inside the compartment called the log, I think they adjust the air and gasoline mixture. Could it be one of these? What is your advice? I wish you a good day... From Tuzla, Istanbul Greetings... Gasoline reaches the injectors. In addition to the fuel pump, there is also a pressure box that pushes the fuel forward.
Ok so when fuel is not reaching the pistons my first thought would be to look at your kill switch also known as your Emergency lanyard. Is it on?
Secondly how are your batteries, fully charged? Low batteries can sometimes cause intermittent issues.
Does your engine have a neutral safety switch?
These three things can cause the motor to not push fuel into the pistons so that the engine won’t start.
Let me know what you find out
Dude thank you so much
Glad you found the video helpful! Thanks for watching Curtis
Bro help please my primer won’t get hard
Did you check the fuel pumps. Also is your engine acting a certain way?
@@ReelTeaseFishing thanks for the reply ,I’ll check this week,I’m glad I saw your video ,it’s a 70hp Yamaha,basically the engine stops working,everything normal but you can tell it’s the Gas not getting to the motor .
I already have all the parts to do an oil change and change the filters as well as the lower unit ,let’s see what happens. Thanks again
@@MangoAficionado if the engine doesn’t stay on but does stay on if you pump it manually you have a completely failed fuel pump.
By the sound of it seems the bulb is not staying hard because the pump is shot.
It’s also not uncommon to have a primer bulb go bad.
Check fuel lines for any dry rot, cracks etc
Gas is dripping from the block when I press the primer bulb
Dripping from the fuel pump area? From the VST area, from a carb I’m not sure how I can help
@@ReelTeaseFishing it’s dripping from the bottom vst area. I think it’s dripping from the inside because I don’t see any visible leaks from the outside
@@ikelove1973 interesting. So the VST is two parts the top part separates and that takes a big oring/gasket that fails. Yamaha says it’s not reusable. Basically need a new one every time it’s opened for cleaning etc.
also the VST has a lot of fuel hoses on the top side. If they are original, it could be cracked hoses or pinhole causing a leak. Lastly fuel pumps on the block could be leaking, making it seam as if it’s the vST
@@ReelTeaseFishing ok thanx for your help
I have 200hp 2 stroke but now they’re lose in the engine torque
I wish I understood the question. Please let me know what you are having trouble with
Hello there @ReelTeaseFishing. I have a 30 hp 2 stroke , 3 cylinder yamaha DMO. I start her up, let her sit in idle a couple of mins till i get my spearfishing gear in the boat and she runs great, no misfiring, full power, medium power untill i get to my spot and i slow down to anchor and then she shuts down. I pull the cord, she starts for a brief moment and then dies again. I ve inspected the fuel filter and lines ( no opstructions of fuel flow), but i cant do the low pressure fuel pump test you ve showed because the pump is connected to the middle carb. I took the pump of, both membranes and metal valves look to be in good condition, no junk, no tears. Recently all 3carbs have been cleaned, they re spotless. Also checked the plugs, spark is there. Any suggestions??
Did this problem happen before you did the carbs? Remove the silencer assembly (black plastic that covers the carbs and see if you see some fuel leaking from a carb when you shut it down. My guess is one of the carbs is set wrong and allowing too much fuel, flooding your outboard after it gets to temp.
@@ReelTeaseFishing Yes, i had this happen a couple of times before removing the carbs for cleaning and inspection, but on a smaller scale so to say. The engine would die on idle after its been working for a while or was hard to start after getting cold. Then it would shut off when getting in gear. Could it be a failing low pressure fuel pump?? I ll try your suggestion to check for leaking of fuel, although the pilot jets and idle timing are set to yamaha specs..😅
60 hp 4 stroke 2015 found water in gas install bad injectors new plugs electric fuel can here turn on cleaned screen on bottom of E pump empty all fuel filters of bad gas did not check anything else inVST OR WHERE E FUEL PUMP IS LOCATED ALL NEW GAS WONT START. MAYBR LOW PRESSURE PUMP BAD
High pressure fuel pump
This is a low pressure fuel pump
I got 40jp Yamaha Enduro 2stroke Tiller handle long shifts my motor i Lost the speed my running to low speed
Mine is bogging down when i put a load on my 2001 mercury 125 2stroke