My 1991 Foxbody MUSTANG 5.0 Won't Start - ECU Code 96C Fuel Pump & Fuel Pump Relay - How to Fix it
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- เผยแพร่เมื่อ 20 ส.ค. 2024
- Long story short, My 1991 Foxbody Mustang GT 5.0 died and won't start. After checking the codes on the car, I have an ECU code 96C which is a fuel pump and fuel pump relay related issue. Follow along as I diagnose and show you how to fix the problem.
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Crazy to see the fuel pump housing look pretty again! Can’t wait to see you change the fuel pump to a brand new one! Keep the content coming, hope you you’re having a good one
I know right! Thanks buddy. Take care and stay safe!
Lol...sorry, had to laugh when you said, "I hurried up and rushed the car into the garage". I did the same thing when my distributor was going out...it started and ran for like 10 seconds...just enough time to get it from the driveway into the garage. Keep it going man...great videos. -Sean, California
HAHAHAHA - the things we do for these car right!? Thanks a lot my friend - take care!
My kinda mechanic. Works in flip flops and a tank top ! Nice work
Hahahaha you betcha!
OBD1, the good ole days. When you can climb into an engine bay and work
Lol it’s true
And dont forget having to cycle the ignition for certain codes to trigger idiot lights a certain way
Man, that sucker looked like it went down with the Titanic! Good vid, Buddy!
Thx pal! Yeah it was pretty bad….
Only in Canada we can have 4 seasons in one day. Lol.
I mentioned in a past comment from an older video that you should add a 5inch fuel line to your fuel return line in the tank to stop aerated fuel. I was hoping you would have done it because you would notice the improvement with smoother idling and taking off in first gear. I'm happy I did this to mine.
When I changed my fuel pump I had a loose bearing in it. I heard this from shaking it. And I knew this was my problem from it failing.
Explain in more detail please thanks
Lol it’s true!! Yeah I never did make that upgrade but sounds like a good one
@@MrLocomechanic here is a video that explains the situation;
th-cam.com/video/lEYD5-plOUs/w-d-xo.html
One of the first things I had to do with my fox when I got it was a fuel pump! From my experience the pump always goes bad especially a tired old one when you fill the tank up that cold gas shocks them! You should get yourself a fuel psi checker tool there’s a schrader valve right behind your alternator in the fuel line. It should be around 30 psi ! But definitely good idea changing that pump and also I know that fuel filter is new but for a few dollars you might wanna throw another new one in mine clogged up in a week all depends how much sentiment in that tank 👊👍
Yessir! I do have one sitting here just for that reason. But I think I’ll probably change the tank etc this winter and just start fresh 👍
That's a win! What a pain but a win! Love that your family was helping including the dog. Good stuff man.
Thx buddy!!! So far it’s been great! 👊
Awesome! I. Impressed at how clean that project was. I do that and everything is filthy including the neighbor's dog. Hahahaha
🤣🤣🤣👌
I had a crazy situation with mine...the baffle inside the gas tank came loose and messed up the fuel pump. I replaced the tank and got the largest in tank pump I could get. From CJ Pony Parts. That was over 5 years ago. My car still needs some work done...but like all projects....family comes first and that car will not see every last dollar....but more likely.....might the dollar last. Haha!
LOL - I love it! Yeah, these poor cars have not always had the best care taken of them; but honestly, I don't think that the "lack of care" is always intentional, much of it comes from lack of education i.e. Fill the tank before you store it. I hope these videos will help people in the education department so we can keep these awesome cars on the road! Thanks for reaching out 👍
Ethanol fuel (E10) attracts moisture especially if it sits awhile. If the car is not going to be driven much you should put in rec fuel, which is 100% gasoline no ethanol.
I don't think we have that up here where I am in Canada...?
Bringing the helpful info as always 👊
Thx buddy!!!
Great info as always! Love your channel and Foxbody content!!
Thx buddy! I really appreciate that
Had the same problem with my low mile 92. (44000 km's) ended up replacing the tank and sender and pump assembly. Never store an empty tank!
Amen brother! I hope this shows a few people the repercussions of not doing it and saves the some time/money/and headaches! Take care
Awesome vid, thanks for sharing…thought it may help with our problem-occasionally the car just won’t crank or start. Lights work, fuel pump starts but no start or crank. Checked starter and battery connections, all tight. A few minutes later it will start right up, run for a few days and then do the same thing. Any suggestions/help would be appreciated. Thanks🤘🏻
Thank you!! I would be inclined to check the starter solinoid on the driver side fender. It can cause similar problems to the ones you are experiencing
@@KASLCustoms awesome! Thanks for the reply and insight.🤘🏻
No problem at all! Good luck 👍
@@KASLCustoms so, update- just got back from auto parts store with a new solinoid, installed and she starts! If things change I will update here. Thanks again man-much appreciated. Cheers,🦊🔥🤘🏻
That’s awesome!!! Glad I could help my friend!
lol I didn't watch whole video good job bro
shoulda changed out the fuel filter as well... good vid tho keep up the great work!
I did 👍. Thanks buddy!!
Great video! 👍
Thx buddy!
Don’t put the rusty tank back in it, NO lol. I got a new tank from AutoZone. Took 1 day to get. Reschedule your AC appointment. Too late. BTW the tank straps and cover look great. Will need to do that to mine
I know buddy - not ideal but up here in the "Great White North," parts are not as readily available and shipping take Forever! At this point, I am trusting that the sock and inline filter are doing their job 😉. Thanks for reaching out and I hope you're keeping well!
My89 does this a lot and even fresh start after 3 mins put into reverse and dies or coming into my paved driveway. Rebuilt Jensen 2.3 from Napa shop
Been there twice so far..buy a quality pump. With that much condensation. .hows your brake fluid look at the bleed lines?
PS: good info: when you plug your reader in...make sure you don't plug you underhood light connector in by mistake! I had mine unplugged. !!! They both have the same plug style. I did and fried my meter and a wire input on the CPU. 5.0 would not run after that! You will have to jump a trace inside the CPU (no.12?).and all is back to normal. DP 😎
Thx buddy! Oh wow, I didn’t know that. I think this was the first time this car had ever been plugged into a code reader so everything was tucked into the shock tower are it should’ve been from the factory 👍
Yeah that's funny when you go out with a hot looking car like that and it won't run it's embarrassing. I remember once I was in Laguna Beach and my car was parked and I noticed people were taking pictures of it. I got in it to leave and the damn thing wouldn't start. I wanted to cry. I'm a girl I can do that and get away with it. But boy that was upsetting. Figured out it was something in my steering column that was loose. Jiggled the keys and the steering column and it started. Yes those Fox body crickets. Got to love em.
Hahahaha so true! I’ve been to Laguna once - you definitely want to make sure the car is right and tight if you’re taking it there!!! 🤑🤑🤑💰💰💰
My 87gt project i plan on installing a new gas tank and fuel pump. Seems to me to be a no brainer replacing a 30 year old tank and installing a new fuel pump.
Yeah it’s a good call. Can’t hurt anything 👍
My issue is that fuel pump sound is staying on and not turning off. Brand new pump btw. Hopefully its just the relay under the seat
Could be the relay 👍
In my case it was the capacitors in the original computer I had Gary Vance the EFI Guy repair my computer. Hope you can figure it out in my case the fuel pump would run constantly and the injectors would not fire. '89 5.0L
I am having a similar problem with my fox. Car ran great for a few months and then all of a sudden just died. The fuel pump is a new areomotive 340 which came with the SVE fuel line kit. When I turn the key into accessory mode, no prime. But when I turn the key all the way forward without the clutch and you can hear the pump run. Changed the TFI module and the fuel pump relay. It is definitely frustrating I would love to get my car running again.
If anyone has any ideas that could help me out it would be greatly appreciated. Love your videos keep up the good work!
Maybe the ignition switch?
Thx for the reply! I did some further testing and believe it's the TPS. When I jump the connections, the fuel pump primes. Voltage reading is bad so hopefully new sensor will fix it up!
@bryanstewart7787 that’s great! Glad you got it figured 💪
Man i had this problem!! It ended up being the ignition switch under the steering wheel! They were known to ware over time!! You can see it coming apart. Try that bro
Yessir - the ignition in these cars is a very common problem. Mine has been great since changing the relay and fuel pump but thanks for the tip and thanks for taking the time to reach out 🙏🙏🙏
tell tale sign when you can hear the pump whine real loud :) Did you remember to put the fuel lines BEHIND the fuel tank strap (where they bunch up near the filter)? Ask me why I know......... :)
Yup. Hahaha yes I did. I even woke up in the middle of the night and went down and checked 😉🤣
if it's not your fuel pump it's your injector harnes
Do you have any idea what the paint code is for the bottom of that vert??? I have a 91 gt that needs the ground effects painted but I’m having problems finding paint for the paint code I have
Hey bud. I’m sorry but I don’t. I’m actually on the hunt for it too. My local parts/paint store can’t even find it 🤷♂️
What type of scanner and manual are you using to get those codes?
OBD1 code scanner. I have a video on my channel
Hey, I have a 92 mustang gt that just cranks over but won’t start. When the key is in the on position the fuel pump doesn’t make any noise like yours does. I checked the relay and it’s good. Do you think it’s the same problem that you had?
It could be a bad fuel pump. Do you have a code scanner? That might be a good place to start 👍
@@KASLCustoms I’ll try it, Thanksssss
@@KASLCustoms and yea that’s what I think that it’s the fuel pump. And I’ll get a friend with a scanner to scan it
Anytime my friend!
If the relay under the driver's seat is wonky will you still hear the fuel pump when you turn the key on?
In theory yes - as long as your pump is still good...
Thanks for the quick reply. I can here my pump it cranks bit won't start I was lining it up in my garage so I could get 2 cars inside and I went into reverse popped the clutch and I stalled it after that it would crank but would not start. So weird I drove it like 15 min before and it had lots of power luckily I was at home when it happened you think maybe I flooded it somehow?
Going to see if it will start tonight never did this before to me .
Would like to get Chris's opinion too.
That’s super odd? Sorry bud I wish I could be more help but it’s so hard to diagnose things when you’re not there in person…
I need help with my fox she’s been sitting for 4 years with 50,000 miles the fuel pump won’t prime and I have replaced a fuel pump and Inertia switch and the fuel pump relay and I also have a good fusible links I even changed my computer still nothing help!!!!!!
Well, it sounds like you’ve changed all the hard parts, so from here I would start chasing wires.
My 91 won’t start turns over no start hood obd 1 reader noting works on it n don’t know what to do any ideas
Oh wow - that’s a tough one buddy. I would start by seeing if you have spark and fuel and go from there
So did you replace both fuel pump and the relay or just fuel pump?
I replaced both but my issue was fuel pump
@@KASLCustoms my car is doing the same thing, recently replace the fuel pump and filter along with a couple of other things, I connected that same device and got the code for a bad TPS sensor I replaced it, it ran good for a little while then out of nowhere it starts shut off, now I'm getting a reading for that same code 96 C said something about a fuel pump secondary unit fail so I was assuming that it could be the relay since the fuel pump is brand new
@@KASLCustoms do you think it would be worth a shot to replace the fuel pump relay ?, I think it could possibly be the issue.🤷😁
It could be the relay. They are cheap to buy and try 👍
Great video! I subscribed! Is there a part 2 video or did the fuel pump fix the problem?
When you running the codes on the car and there done scanning with the code reader and you cut it off the car not suppose to die Right
Sorry boss, I’m not sure I understand your question?
@@KASLCustoms when I do the koer test once it's done I cut the scan tool off and my car cuts off
When you remove the scan tool, the fuel pump should cycle just like it does when you turn your key to run position.
@@KASLCustoms do in other words sound like I may have a weak fuel pump or it's not holding the right amount of pressure at a idle
Are you getting any fuel related codes?
i have the same 96 code.did the code go away after fuel pump replacement?pump just keeps priming with key on.thanks dude
yes, this solved my issue
A fuel pump that’s always running with the key on engine off is a ecu issue. If that’s what your experiencing
I’m dealing with something similar or the same thing right now.. the car has been cranking just fine but while under steady load I’ll feel it kinda stumble on me for a quick second.. like a quick loss of power where it falls on its face.. but now she won’t crank at all.. battery is fine.. alternator is good.. brand new starter solenoid.. it just try’s to turnover but nothing.. the problem is I have a terminator X computer so if I’m not mistaken there’s no way to run any type of codes like with the factory computer…
Did you happen to figure out the issue?? I’m having the exact problem with my fox as you are!
@@tex3962 not yet… now I’m having trouble getting it to even crank.. plenty of voltage at the battery.. the alternator has plenty of voltage and I have spark so I have no idea but it’s really frustrating.. I replaced my starter solenoid and ignition switch and that didn’t help either
@@seanharrison5064 when you turn the key on/engine off, can you hear the fuel pump prime (buzzing noise)? Or do you not hear anything at all?
@@tex3962 yeah it’s priming
Fuel pressure is about 41-42
I'd caution throwing more than one part at a time at it. You'll never figure out what it was (the chicken or the egg).
LOL - I know right! That said, I am sure glad I did not just change the relay and got to the heart of yet another problem...
@@KASLCustoms that's true
My 93 vert is giving me starting issues. Solenoid good, new ignition switch, starts when I jump the Solenoid. No power though the red with blue stripe trigger wire. All I hear is a single click down by the fuse panel. Like a relay, but there isn't one according to my research. I'm stumped
Is the starter good?
ya been there with a chevy truck aft I filled the tank
LOL - I was cursing myself but truthfully, it was an honest mistake that had good intentions 👍
@@KASLCustoms ya that is what I tell myself to LOLOL
🤣👊
Your whole fuel system is contaminated. Spend the money, get a new tank, filter, sending unit, remove your fuel rails and blow them out, and new injectors. Don't short cut on this...
She’s running like a top my friend 👍
mot not be gettingbits 12vlts
It seems like fuel injected foxes have a bunch of fuel and idle issues,thank god i got an carbed fox.
That typically is what folks do, who don't understand EFI. Some people feel more comfortable with Carb, in fairness, it's much easier to work on than EFI. Personally, I cut my teeth in EFI.
@@jpp9846 I'm comfortable with both,but it seems like as these cars got older they have alot more fuel issue's than a carbed car that's older,and the computers are getting old.
@@djdev3077 I agree, the ECU in them is getting old. The Holley Terminator X is a great replacement
My buddy just swapped his coupe over and really likes it as well
This is true as well
So inspection dudes take your collector cars out for test drives? not too mention grease monkeys fiddling around with them? fuk that noise.
Lol. ..your luck is like mine. It won't even try to start?
Play some sound garden liar. It will start
Who can drink 5 gallons of gas and not get sick??
🙋♂️😉