What he said.
No fuel pressure
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1st Gear
Joined: Nov 2020
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No fuel pressure
I bought a 1999 Corvette to restore for my wife but I'm getting zero fuel pressure. I read somewhere that fuel pressure is controlled by the fuel filter? Any help would be appreciated. I'm kind of hard of hearing but I don't hear a fuel pump clicking when I turn on the key.
Last edited by Cajuntinman; Nov 11, 2020 at 12:46 PM.
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From: South Hill Wa
2022 C5 of the Year Finalist - Modified
2021 C5 of the Year Finalist - Modified
When in doubt take the hose off the fuel rail and put it into liter bottle. Cycle the key and you should get about a cup of fuel. If you get nothing either your pump is not receiving power or the pump itself is dead or there is a problem in the filter.
You can get a release tool at autozone for a couple bucks for the hose.
There might be better ways to troubleshoot this but above is what I would do. It's quick and easy for me.
Welcome to the board. I hope you get it running soon.
You can get a release tool at autozone for a couple bucks for the hose.
There might be better ways to troubleshoot this but above is what I would do. It's quick and easy for me.
Welcome to the board. I hope you get it running soon.
Moderator, Tech Contributor
Joined: Sep 2013
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From: Cape Coral, Florida
Welcome to the Forum !!...sorry to hear you're having pump issues...first of all the pump will prime for 2 seconds and shut off when the key is turned on..if your wife's hearing is better she can remove the fuel cap and listen there or position herself at the lower part of the left rear tire on the forward side...if still no luck you can try swapping the pump relay with the horn relay and see what happens...if still no good you will have to dig a little deeper and not knowing your mechanical skills I won't go in depth. Enclosed is a YouTube video I did on checking that circuit.
Oh, BTW I myself had a no prime condition a few months ago and I diagnosed it as a bad relay...was around $20.00 at the local Chevy dealer...I did want to get the CORRECT OEM replacement...some of these knock off parts are hard to spot !!
Oh, BTW I myself had a no prime condition a few months ago and I diagnosed it as a bad relay...was around $20.00 at the local Chevy dealer...I did want to get the CORRECT OEM replacement...some of these knock off parts are hard to spot !!
Last edited by C5 Diag; Nov 11, 2020 at 05:51 PM.
Drifting
Joined: May 2007
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From: Huntersville, NC
I bought a 1999 Corvette to restore for my wife but I'm getting zero fuel pressure. I read somewhere that fuel pressure is controlled by the fuel filter? Any help would be appreciated. I'm kind of hard of hearing but I don't hear a fuel pump clicking when I turn on the key.
the regulator is on the fuel rail. C5 Diag is heading you down the right path Start with fuses and relays. It may be the pump. That is a big job, so make sure you are ok electrically. There is another fuse for the injectors too. If you haven’t confirmed no fuel in the rail properly, then that is another possibility
Instructor
Joined: Nov 2010
Posts: 100
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From: Katy TX
the regulator is on the fuel rail. C5 Diag is heading you down the right path Start with fuses and relays. It may be the pump. That is a big job, so make sure you are ok electrically. There is another fuse for the injectors too. If you haven’t confirmed no fuel in the rail properly, then that is another possibility
It's easy to confirm - if you only have 1 braided stainless fuel line into the rail - the regulator is in the filter.
You can also use a jumper wire at the relay mentioned above to check if the pump works (bypassing the relay).
There is a diagnostic thread on here where Bill Curlee walks through a number of tips on checking the fuel pump circuit.
Burning Brakes
Joined: Nov 2003
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From: Gold Canyon AZ
I already changed the filter, so I'm guessing bad pump?
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From: South Hill Wa
2022 C5 of the Year Finalist - Modified
2021 C5 of the Year Finalist - Modified
If you are getting visible fuel flow for the two seconds prime then I don't think your pump is bad.
I assume you are having a cranking no start?
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Joined: Aug 2018
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From: South Hill Wa
2022 C5 of the Year Finalist - Modified
2021 C5 of the Year Finalist - Modified
I am pretty sure that's normal. If you want to hear the pump run constantly and defeat the pump prime circuit you can bypass the fuel pump relay with a heavy paper clip. This will make the pump run until you take power away.
Have you checked your codes?
Also another super quick test on crank no start is to unplug the MAF sensor. They can go bad enough to keep the car from starting. You may have to give it a little throttle with the MAF unplugged.
Have you checked your codes?
Also another super quick test on crank no start is to unplug the MAF sensor. They can go bad enough to keep the car from starting. You may have to give it a little throttle with the MAF unplugged.
Burning Brakes
Joined: Nov 2003
Posts: 758
Likes: 3
From: Gold Canyon AZ
I am pretty sure that's normal. If you want to hear the pump run constantly and defeat the pump prime circuit you can bypass the fuel pump relay with a heavy paper clip. This will make the pump run until you take power away.
Have you checked your codes?
Also another super quick test on crank no start is to unplug the MAF sensor. They can go bad enough to keep the car from starting. You may have to give it a little throttle with the MAF unplugged.
Have you checked your codes?
Also another super quick test on crank no start is to unplug the MAF sensor. They can go bad enough to keep the car from starting. You may have to give it a little throttle with the MAF unplugged.
car will fire for like 2 seconds, if I hit the gas it dies immediately, if I don't it will sputter and stall.
unplugged the MAF same thing, almost. It dies if I hit the gas, but if I don't it takes like an extra second to sputter and stall.
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Joined: Sep 2013
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From: Cape Coral, Florida
Don’t know what skills you have or if you have a test light but follow my YouTube video in post #3...a quick check to see if you have a fuel delivery issue is to spray Brake Kleen or starter fluid into the brake booster hose or PCV going into the intake manifold...if the car runs for a bit you have a fuel delivery issues!!...as was mentioned jump terminals 87 and 30 at the pump relay...see if the pump runs...if not you have some troubleshooting to do...or take the car to a shop...not a complicated system at all !!
Burning Brakes
Joined: Nov 2003
Posts: 758
Likes: 3
From: Gold Canyon AZ
Don’t know what skills you have or if you have a test light but follow my YouTube video in post #3...a quick check to see if you have a fuel delivery issue is to spray Brake Kleen or starter fluid into the brake booster hose or PCV going into the intake manifold...if the car runs for a bit you have a fuel delivery issues!!...as was mentioned jump terminals 87 and 30 at the pump relay...see if the pump runs...if not you have some troubleshooting to do...or take the car to a shop...not a complicated system at all !!
Burning Brakes
Joined: Nov 2003
Posts: 758
Likes: 3
From: Gold Canyon AZ
I'll check gauge tonight