How a Vapor Separator Tank Works on an Evinrude E-tec Outboard Motor, and How Mine Broke.
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- เผยแพร่เมื่อ 24 ก.ค. 2021
- Hello Everyone, Just a quick un-edited video explaining what broke on my outboard motor the last time I was out. The fuel vapor separator tank or VST got a crack in it when the jet foot smashed into a rock and fuel started leaking from it. It is basically a water cooled recirculating high pressure fuel system, which is required due to the high fuel pressures used in these direct injected engines.
I'll be back with more gold mining videos soon enough, now that my boat is fixed!
The part cost $736CAD shipped to my door and was purchased from evinrudeparts.ca. Part #5010818.
My Website: www.utmostoutdoors.com
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I learn more on TH-cam than I did in school. Thanks for that awesome explanation on how that basically works. I just had that replaced on my 2015 ETEC. Cheers!
Thanks for watching man! Hope you're engine is running well once again!
That sure was a solid hit to the intake, gosh it’s lucky it didn’t rip the whole motor off lol.
Good work getting it diagnosed and repaired.
YOU watch MY videos?!? That's awesome! Love what you're doing over in BC! Best of luck this fall season!
@@UtmostOutdoors awe thanks man! Yes I found your channel the other day and I just love seeing other people’s adventures, I love how your using boats to prospect it’s unique.
My mother lives in Lacombe so I enjoy seeing the areas as some I recognize. I always drive through Cochrane heading from BC to Lacombe.
😀🍻🏔⛏
Thanks man saved the day for me! Routed the tube's wrong lol
Glad to hear it was helpful!
The hose clamps are called Oetiker clamps. Great video, thanks.
That float lets vapor out while the separator is filling and returns the vapor to the block. It does not regulate fuel other then making space for it
Well explained , need to change a mates hi pressure pump. Cheers.
My 115 hp VST tank cracked and I don't remember hitting anything. Just got a call from the shop $1100 for the part Good vid thanks
Solid information! Right on!
Interesting I like learning about stuff I work on small two stroke outbords I do have a 1984 115 hp Evinrude I also work on thanks for the info
I'm glad you enjoyed it! I wasn't sure if I should even upload it at first since I'm not sure how it fits the channel...
The VST on Etec's contains a spring regulated fuel presure regulator on the return line coming back from the injectors it holds the presure at 25 to 30 psi , this returen line has its own tiny filter on it and it can cause a real headache when it clogs , as the returing trying to flow through this small return line filer backs up behind the cloged filer and it pushes the fuel presure in the injector fuel loop into a much higher presure then it should be , this puts a lot of stress on the electric fuel pump and also becuase the presure is to high it throws off the fuel delivery systems calibration making the motor run rich ,, make sure to check this filter if the presure is to high or the motor runs poorly.. its matanance catches a lot of people by suprise..
Thanks for the info. These outboards sure are impressive pieces of engineering!
Hope you get it fixed soon and back on the river.
Thanks!
great vid very helpful
Glad it helped
Thanks I really learned a lot with your video
Glad to hear it!
The VST system takes low pressure fuel , delivered from the low pressure diaphragm lift pump cools it with a coil supplied with pressurized flowing water from the water pump to ensure it does not form vapor bubbles, providing a reservior of cooled fuel to inlet of medium pressure electric fuel pump, (which I know has fine mesh inlet screen that can get plugged on some of the VST designs) causing a low fuel flow and low pressure issue something to look into, its second function is it contains a spring loaded fuel pressure regulator that also has a very fine mesh filter in its fuel flow path, (if this gets clogged the fuel pressure regulator can not release the extra built up pressure from the pump and you end up with fuel pressure that's way too high as well as this issue putting a lot of added stress on the medium pressure fuel pump" This fuel flow loops through the injector housing , "cooling" the injectors powerful electromagnet driven by high current pulses from the EMM that's why there is a return loop circuit back into the body of the VST "Through the pressure regulator contained within it" , The electromagnet inside the E-tec injector is fired by a timed high current pulse hammering the plunger down inside the injector to create the very high pressures needed to deliver atomized spray of fuel from the injector nozzle into the cylinder, as its timed to fire that pulse while piston has passed the exhaust port its injecting fuel into a cylinder that is under high compression already so the injector has to overcome this. . Its the medium pressure fuel pumps job to insure the injector always has a supply of cooled fuel with no vapor bubbles within its volume. supplied at the correct pressure, as the medium pressure pump operates and builds pressure in the injector loop it opens the spring loaded pressure control valve and the heated fuel from the injectors returns to the VST to be cooled by the cooling coil, then is pumped back through the loop through the injector body again to supply fuel to the injector plunger "and" once again cool the Electromangnet so the injector does not cook itself with heat buildup.. if the internal cooling coil leaks you will end up with water in the fuel going through the injectors and this destroys them in short order (its a really bad issue for motors run in salt water) if left to sit due to the corrosion and fuel breakdown within the injectors fine passages (The injectors also have fine mesh screens within them them that can get plugged with the gunk these can be changed or sent in to be cleaned ) th-cam.com/video/szVYNHieCbQ/w-d-xo.html and not surprisingly causes serious run ability issues
That's a great explanation and write up, thanks!
Kind of pricey but I'm glad you got it fixed. ✌👍
Thanks!
the "fuel pump" though technically correct as its the same traditional diaphragm type used on a million other OMC models, actually acts more like a "lift pump" in an Etec, drawing fuel from the tank, to the VST but the main high pressure fuel pump is the real critical one, circulating fuel to and through the injectors and back to the VST for cooling and dumping the excess into the crank case.
Interesting tape - thanks for sharing.
Well done on finding the broken component - whoulda thought hitting a rock with the bottom of the boat would break something near the top of the motor
I guess you must have investigated ways of repairing the damaged item ?
Thanks for watching. Since the plastic part was under a fair bit of pressure, I didn't want to risk some sort of plastic repair when the consequence for it failing again might mean not getting to motor home.
@@UtmostOutdoors We all afraid of what we don't know - lucky you are rich lol
I may have tried filling the crack with superglue and then wrap a hose clamp around it
Great video!! Thank you , just replaced the same thing yesterday…. I have a question, did you install the water restrictor? I mean is it there. For a reason that you have noticed ? Perhaps with this new brand of pump it requires a different pressure to reach all the parts in the water circuit cooling circuit? Curious to know why is there
I did install the water restrictor and still have it on there. I never had any problems before, and haven't since. My best guesses are that maybe if the water pump gets weak over time, water that is pumped up into the engine may drain out too quickly and leave parts of the cooling system dry, or maybe a slight pressure keeps the water from boiling off just like a car's radiator is kept under pressure?
This is an amazing explanation. The old VST you have there has shraeder valves to test fuel pressures, do you have any idea how to test pressures on the new VST? I don't see any external connection points. Mine looks like the second on a 90hp, but I'm the second owner so maybe they had it replaced and this is the new version? Not sure.
Thanks! Sorry, I have no idea how to test fuel pressure with the new system.
Do you have the old pump ? Desperet need of parts 😅 and thanks for a really usefull video! Learnt a lot!
Sorry, I already gave away the old pump. Thanks for watching!
I just disassembled an old Carter VST that was replaced for about $700.00 just to see the insides and to my shock there was no coil inside that should hold the cooling water. What the heck??? There had to have been one there or we would have been mixing water and fuel. I hate to think that the mechanic took it out before returning my old parts which I requested, but I can't think of anything else. Really???? Your video made me curious to look. Wow!!
I wonder if maybe it used a double wall instead of a inner coil? I have no idea, but there must be some way they engineered in to keep water and fuel separate...
@@UtmostOutdoors I don't think so because there is no inner and outer wall, but the two water 'nipples' on the outside are there and on the opposite end, inside the cylinder where the water coil should be attached, it is threaded. Water would simply mix with the fuel. It would be nice if TH-cam would allow pictures with comments. Unbelievable!!
Is the fuel/vapor pump usually replaced on Evinrude's 3-year maintenance schedule? I have a 2010 ETEC 40. Thanks for the video.
I am not an outboard technician, so take this with a grain of salt, but the 3 year service does not include replacing the fuel/vapor pump. At most it would involve changing the little secondary fuel filter inside it. Otherwise I imagine it would just involve water pump, thermostat, filters, and spark plugs. Also gear oil if you have a lower unit. Your ETEC 40 is a nice engine, enjoy it this summer!
@@UtmostOutdoors Thanks for your response. Hope you have a great summer with your ETEC.
Saw a you Tube vid by a John boat company advertising "gator bottom" epoxy coating to slick up rock bouncing,help stop getting stuck in low water conditions..just sayin..after you recover from motor repair hit, give it some thought. My buddies drift boat was night and day difference after we plasticed bottom
Gator glide is product name
I'll look into it, thanks!
hello my friend. My Evinrude etech 30 hp engine is leaking oil from the tail joints. The smoke is not coming out completely from the exhaust, I think the engine is choking and not working properly. Why does this?.. What should I do?..Thank you..
Hey, I'm sorry, but I'm not sure how to help. I'm not an outboard mechanic. Best of luck with your repairs freind!
Hey man great video can you add a link to where you bought the kit from thank you
Hey Larry, thanks for watching. I bought it from evinrudeparts.ca. You can click through their website to the "parts finder" and search for part #5010818.
Or try this direct link: www.evinrudeparts.ca/oempartfinder#/s/EVI%7C~CDN//5010818//1/y
Of course double check you're getting the right part for your outboard before ordering, they aren't cheap!
Wow! That’s going to cut into this years profits.
Yep! Got to do what you got to do I guess...
How much you asking for old fuel pump ?? Need one
Sorry, I think I might have gotten rid of it already. I'd probably just sell it for price of shipping since it's cracked and I have no use for it.
@@UtmostOutdoors Pump is cracked or the separatortank , I’m looking for a fuel pump itself
@@seppi171 Fuel pump should be good. Contact me through my channel email you can find in my Channel's "About" Tab and I might be able to ship it to you. I'm just away for work right now and can't 100% remember if I still have the part sitting on a shelf or not...
@@UtmostOutdoors Sounds good , thanks
Which plastic ones you talking about? JetWolf of Russia has one you can smash over and over with a sledge hammer and won’t break. Check them out on Instagram. I wanna get one
Yep, I think those are the ones I was looking into. I just need to double check my impeller size. Thanks.