Fuse/Relay for Fuel Pump.

[lkurek]

....which is also a good way to tell when your fuel pump relay has taken a dirt nap. If you have to crank the engine for a while until it fires up, and then it runs normal....it is usually a sign that the relay is dead. Like 3100 said, it is a backup thing. GM assumes that if the engine is generating oil pressure, then it must want fuel..... I wishit would work the OTHER way too.....if you lose oil pressure, it kills the pump.

[pocket-rocket]

I wishit would work the OTHER way too.....if you lose oil pressure, it kills the pump.

Assuming your fuel pump check valve is good and your line pressure doesn't leak down, in theory, couldn't you remove the relay and let the oil pressure sender power it?

[3100 MPFI]

With Ben's car, when we were doing the 5-speed swap, he had trouble with it blowing the fuse. It turns out that when we pulled the oil pressure sensor, it worked fine, and the fuse didn't blow any more.

With the car being hard to start, I usually think the fuel pump PULSATOR going bad is what causes that. When I got my 1990 Grand Prix STE, it was hard to start in the mornings, but the rest of the day, it was fine. The seal for the pulsator had blown, and when I replaced it, it was fine. Now, it does not lose fuel pressure like it did before I fixed it.

[packardbell]

sorry to resurrect an old thread but i am in dire need of help with my 1988 cutlass supreme international with the 2.8 MPFI in it.
problem is the fuel pump does not shut off after i shut off the car, pulling out the fuel pump relay does not shut off the pump, pulling off the plug from the oil pressure switch (1 terminal) does not shut off the fuel pump, but pulling out the 20 amp fuse besides the fuel pump relay does shut off the pump.
what other switch can still supply 12V to the fuel pump? I think there is another switch that GM must have used back in 1988 in addition to the oil pressure switch.
need help guys.