1988 Ford F-250 4x4 460, multi port fuel injection. dual gas tanks. Its started with intermittent problem, truck would just die, but start back up after a while, sometimes right away, others almost drain the battery to start it. in finally gave out for good, checked presser at rails nothing, ran alternate power to pump for a second and fuel presser jumped right up to 6lbs. but only ran it for a second. i don't do so well reading wiring diagramms
Have a diagnostic check run.
There should be a relay for the fuel pump. I think your fuel pump is out though. You should have more fuel pressure than that.
As with any electric component, always check the ground. If it is rusted it will have high resistance and not let the pump work. There is a high chance though that it just wore out and needs replaced.
