OBS_Trash
OBS Enthusiast
I came across a couple YT videos of fuel pump stuff, 2 references state anything below 55psi will give issues. Mine is 50# running. Anyone else have 50# and no issues?
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1996 - 5.7 350
I’ve replaced every GD thing aside from the Fuel pump,(EGR.FuelFilter.MAF, Plugs.Wires.Rotor.Cap.Ignition Coil.IAC.CrankShaftposition sensor.EngineCoolant Temp, New Fuel spider Injection assembly with new Fp Regulator
WHICH spider assembly did you install? OEM poppet-injector or the upgraded electronic injector?2 references state anything below 55psi will give issues. Mine is 50# running. Anyone else have 50# and no issues?
OEM Poppet, which includes new fuel pressure regulator too (just for others that may not realize that reading this thread)WHICH spider assembly did you install? OEM poppet-injector or the upgraded electronic injector?
The electronic injector spider is less-sensitive to lower fuel pressure (within reason.)
Too bad.OEM Poppet
Is that with idle vacuum or no vacuum?I came across a couple YT videos of fuel pump stuff, 2 references state anything below 55psi will give issues. Mine is 50# running. Anyone else have 50# and no issues?
Well, that’s me driving it around the block with the gauge laying on my windshield.Is that with idle vacuum or no vacuum?
Well there you go. Did you even read the previous replies? The test is conducted with the engine off, key on.Well, that’s me driving it around the block with the gauge laying on my windshield.
I’m going with…..Idle?
I've had 4 of these GMT400's. They all have fuel pump problems, even if you use Delfi or Delco fuel pumps. They will not start with less than 50lbs. The pumps always seem to pump enough volume but lack pressure. I have cured every one of them by copying a "Ford" idea. Leave the pump in the tank and add an inline pump from a mid 80's F150 302 to the frame. Tou have to make a bracket, mount usually somewhere before fuel filter. Add after market relay that triggers off original fuel pump relay to run new pump. Also leave original relay hooked up so that tank pump just becomes feeder pump to new pump. By doing so all safety protocalls are in effect such as shutting of when engine dies incase rollover etc.. It will start and run better.WHICH spider assembly did you install? OEM poppet-injector or the upgraded electronic injector?
The electronic injector spider is less-sensitive to lower fuel pressure (within reason.)
I've had 4 of these GMT400's. They all have fuel pump problems, even if you use Delfi or Delco fuel pumps. They will not start with less than 50lbs. The pumps always seem to pump enough volume but lack pressure. I have cured every one of them by copying a "Ford" idea. Leave the pump in the tank and add an inline pump from a mid 80's F150 302 to the frame. Tou have to make a bracket, mount usually somewhere before fuel filter. Add after market relay that triggers off original fuel pump relay to run new pump. Also leave original relay hooked up so that tank pump just becomes feeder pump to new pump. By doing so all safety protocalls are in effect such as shutting of when engine dies incase rollover etc.. It will start and run better.