Question about 1997 Cadillac Catera

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What is the fuel line pressure when the engine isn't running

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Fuel pressure should be 46-59pst regardless if engine is running or off

however, seeing a difference of 10psi once you turn the key off is not uncommon

The question should be what pressure is after an hour

if you loose too much pressure then you are probably dealing with a leaking injector ir a check valve in the fuel pump


Posted on May 08, 2010

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My 94 Thunderbird won't start until like the 4th crank, then it runs like a champ. It acts like it isn't getting any fuel. Please help!


You may be right on your hunch.
The fuel pump gets power from the pump relay for 3 seconds when you turn the key on, then no power until the engine starts. If the fuel pressure is low it could take several trys to get the pressure up to normal and the engine start.
A mechanic would check the pump relay and the fuel pressure with a gauge before and after cranking the engine.

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Fuel pressure problem on a 1997 oldsmobile aroura


Thanks for choosing FixYa and welcome. What all is going in?

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When warm my 99 camaro v6 runs like ****. I can't


Well, the first thing I would ask is what codes are you getting from the computer? If it is running that bad, your check engine light has got to be SCREAMING at you.

Then, you sort-of answered the question for me by stating that the fuel pressure is at 38 psi. The fuel pressure specification for a 1999 Chevrolet Camaro equipped with a 3.8L V-6 engine is 48-55 psi. I'll bet you have lean oxygen sensor codes and a random misfire code. (they'll do that when the fuel pressure is low.)

I would first try replacing the fuel filter and see if the numbers don't come up.
If that does not work, block the fuel return line and see if the numbers get better. If they do, you have a bad fuel pressure regulator. If they don't you either have a restriction in the fuel line or a bad fuel pump.

Sep 11, 2011 | 1999 Chevrolet Camaro

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91 oldsmobile custom cruiser will not start, did test and we get spark. The fuel pump continuously run when key is turned. Have replaced fuel pump relay. Next suggestion was to replace ecm fuse - but...


The bigger question here is whether or not the fuel pump is delivering fuel when it runs. Fuel pumps work on pressure. Once the pressure builds up in the fuel lines it will shut off until the pressure drops, then it turns on again. The fact that your pump doesn't turn off suggests that either it's not pumping any fuel out of the tank or it's not building any pressure. First thing to do is make sure there is fuel in the tank. It's possible your fuel guage has stopped working and is giving a false reading.Start looking for gas leaking under the car. A leak that let's the pump run continuously should leave a very visible wet spot. Look at the top of the tank as best you can too. Loosen the fuel line at the throttle body and see if you have pressure there. Maybe it's pouring fuel into the engine and creating a flooding condition. The fact that it runs continuously would suggest the problem isn't the filter. If the filter was plugged it would build pressure. If you can't find anything here I think you are going to have to drop the tank and start looking in there to see why it isn't picking up fuel, possibly replacing the pump. Hope this helps.

Jun 11, 2011 | 1991 Oldsmobile Custom Cruiser

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I started my truck up this morning and let it idle as always everyday and all of a sudden the engine turned off like if someone fliped a switch or something...checked for spark at the coil and found no...


Your fuel pump runs for a few seconds when you turn the ignition is turned on because the fuel pressure naturally eases off when the engine is stopped, it runs until it gets to>< 30PSI and kicks off. This is normal, you know that fuel is reaching the injector line. On some engines there is a solenoid that has to trigger before fuel can go into the fuel lines for the injectors. If this solenoid isn't firing the computer will detect it and shut off the ignition. Look for some kinda solenoid or gadget where your fuel line come up in front of the fire wall. It should be close to where the fuel line splits off to go to each bank. Hope it;s a wire come unplugged and easy fixed. dhgill1949

May 22, 2011 | Chevrolet Silverado 1500 Cars & Trucks

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Shouldn't there be fuel pressure with the key turned to the run position? I only get fuel pressure when the starter is engaged and turning the engine over.


no you will not have fuel pressure untill the engine is running

fuel pressure is not required to start the engine...only to keep it running

when you turn the key on the computer send a signal to turn the fuel pump on for a second and prime the engine...once it starts the fuel pump relay kicks the fuel pump on then you have pressure.

Feb 06, 2010 | 1993 Toyota Corolla

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Runs ruff at idle and when excellerating is missing


yep change the pump! and new filter too!!!

Jan 13, 2010 | GMC Jimmy Cars & Trucks

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Car wont start. Has spark, tried Carb Cleaner.


You may be weak on fuel pressure . even a couple of lbs low on a cold start will cause a no start.
Double check cold start cranking fuel pressure. If under 63-62 lbs you have problems.
one test is to give it a squirt of carb cleaner not starting fluid. If it starts then you have a fuel pressure problem.
Run the full fuel pressure test and post back pressures.
Here is the guide lines on testing.
Hard to start cold.
Check cold start fuel pressure.
Check engine running fuel pressure.
Check engine running on the road fuel pressure.
Then shut it off and watch for fast leak down.
Pinch off at rubber part or block off return line and check full pressure.
Later V6 and V8 gm engines should have 60-66 fuel pressure.
Cold start should be 64-65 lbs of pressure.
If you do not have full fuel pressure on a cold start the injectors will not squirt fuel.
Do not leave home without it.
Engine running should be 60-66 lbs pressure depending on engine load.
Full pressure with return pinched off should be 75-85 or more.
And if it has a fast leak down after shut off you have a leak.

The 75-85 is only a check on the capable full pressure of fuel pump.
If you can not find the rubber return line check full pressure by plugging return line or just or the true full pressure can be taken direct at the end fuel filter.
What are the pressure readings that you have done.
What are your cold start pressure readings?
Post back what you have. Good Luck

Dec 24, 2009 | 2002 Chevrolet Blazer

2 Answers

On cold mornings, will not start and just "turn over" replace fuel pump and complete tune up ..still the same problem


You may be weak on fuel pressure . even a couple of lbs low on a cold start will cause a no start.
Double check cold start cranking fuel pressure. If under 63-62 lbs you have problems.
one test is to give it a squirt of carb cleaner not starting fluid. If it starts then you have a fuel pressure problem.
Run the full fuel pressure test and post back pressures.
Here is the guide lines on testing.
Hard to start cold.
Check cold start fuel pressure.
Check engine running fuel pressure.
Check engine running on the road fuel pressure.
Then shut it off and watch for fast leak down.
Pinch off at rubber part or block off return line and check full pressure.
Later V6 and V8 gm engines should have 60-66 fuel pressure.
Cold start should be 64-65 lbs of pressure.
If you do not have full fuel pressure on a cold start the injectors will not squirt fuel.
Do not leave home without it.
Engine running should be 60-66 lbs pressure depending on engine load.
Full pressure with return pinched off should be 75-85 or more.
And if it has a fast leak down after shut off you have a leak.
Post back fuel pressure readings.

The 75-85 is only a check on the capable full pressure of fuel pump.
If you can not find the rubber return line check full pressure by plugging return line or just or the true full pressure can be taken direct at the end fuel filter.

What are the pressure readings that you have done. Good luck and hope the fuel pump is not a bad one you put in there, it's know to happen.

Dec 23, 2009 | 2002 Chevrolet Blazer

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