Fuel pressure drop

[R-235]

Okay i have a 2001 GMC Safari 2wd 4.3. The van will turn over and depending on the day will start after quite some time of cranking.

i have checked the fuel pressure and when the key is turn to the on position the pressure will go to 55 psi then immediatly drop to zero. If i turn the key to the off position and back on a few times the pressure will sometimes hold on 55 psi, but will bleed off with in a few minutes.

The fuel pump also makes a horrible sound when first turned on usually.

Is this the fuel pump or pressure regulator and does this vehicle have a pulsator.

I also took off the fuel return line while i was chekcing the fuel pressure and while i was checking the fuel pressure there was no fuel coming out of the return line and i did not feel any pressure from the return line while i was cranking the engine.

[R-235]

We'll i thought i would advised anyone who cares of what it took to fix my problem.

I removed the fuel tank and removed the fuel pump and sending unit. I found a small hole in the line that runs from the top of the fuel pump to the sending unit. I replaced the fuel pump as a unit and fixed the problem. the fule tank removal was not hard at all, even with me being the only one doing it.

FYI.

[Blue Bowtie]

Thanks for the follow up.

Was it an accordion line that failed? I always felt a little suspicious of those.