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Fuel issue on 94 vette

2K views 8 replies 4 participants last post by  Slicktop 
#1 ·
Knowns: Fuel pump and strainer 1 1/2 years old, fuel filter less than a month old, fuel pressure regulator is the 2nd one installed in the last 30 days.
With KOEO fuel pressure is 37psi (measured with two different FP gauges) and it take from 10 to 12 minutes to bleed down from 37 psi to 30psi.
Have no idea if this is within specs or not? With engine running (which is not often) fuel pressure is 37psi. Due to car dying at will, have not tried getting it out on the road. Car does not run
rough and or miss when it can be started? Sure would like to get the car up and running.. Any thoughts or suggestions..
 
#3 ·
With KOEO fuel pressure is 37psi
Have no idea if this is within specs or not? .
Don't think it is your problem but pressure should be higher
Fuel pressure on LT1 without the vacuum line connected should be 43.5psi @ idle (or KOEO )
Should drop about 6-8 PSI @ idle with the vacuum line connected.
 
#4 · (Edited)
It's very possible your fuel pump relay is failing and that's why it won't stay running. I suggest using a trickle charger to power your pump and then see if it dies. Just disconnect the wires at the fuel tank then supply power directly to the fuel pump's hot wire. If it doesn't die then you can assume the relay is failing or power to the relay is getting interrupted (the power comes from the oil pressure sender). Over time the points in the relay get a carbon buildup and they'll work until they warm up then suddenly quit. If your car has anywhere near 100,000 miles I suggest simply replacing the relay so you'll know it's good and will stay good for a long time...................
 
#7 · (Edited)
He has a fuel pressure gauge which would immediately show if the pump was not being powered. As far as I am concerned, he has an ign problem unless he states that he has good spark and correct timing, and if he states that then it will be time to address the fuel system........... Read his original no start/run thread. Note that nowhere does he say that he actually checked for spark and correct timing, and whether or not he has it: http://www.smokinvette.com/corvetteforum/showthread.php?t=56158
 
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