Quote:
Originally Posted by sfran
Sorry, the truck is a '96, Vortec 350.
I am really thinking it has to be the fuel pump. I pinched off the return line going back into the tank to rule out the pressure regulator. I wanted to see if my pressure jumped with ignition on. No change, still only 15 PSI. This should have ruled out a stuck open regulator. I also pulled the pressure gauge off and put it back on my car just to make sure it is working properly and it was.
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Smell your oil on the dipstick to see if it has gas on it. I think your FPR has a hole in it. If you want, prime the pump while you hold the throttle plate open and listen for fuel spray out the FPR. Your assumption that you ruled OUT the FPR is only correct if the diaphragm does NOT have a hole in it, just that it is sprung and won't regulate properly.
That would obviously account for why a number of fuel pumps did NOT fix the problem.