Zr1 fuel pump 1 not working

[Crazytruk]

I have a 1990 zr1 that sat for a few years. I changed injectors and fuel pumps. The car starts and gets up to a certain temperature and loses fuel pressure and stalls. When I start the car cold and I pull the fuse from the block under the passenger side dash it loses fuel pressure and stalls. I do not think this should happen because the fuel pump one should keep pressure and keep it running. I connected the Lead coming out of the firewall to the positive on the battery and still no change car still stalled when it got warm.
Any Ideas?
Mike

[Ccmano]

Pull the FP2 fuse and see if it starts in the same manner. If it doesn't start you have a bad FP1 pump. The other possibility to check are the hose clamps on the pump assembly or a cracked Y block on the pump assembly. I'm betting it's a bad FP1 pump.
H
:cheers:

[Corvette95]

Pull the FP2 fuse and see if it starts in the same manner. If it doesn't start you have a bad FP1 pump. The other possibility to check are the hose clamps on the pump assembly or a cracked Y block on the pump assembly. I'm betting it's a bad FP1 pump.
H
:cheers:

agreed, you can also check initial fuel pressure with fuel pressure gauge, it will pressure up to 55psi then drop about 5 psi if both pumps are working, no drop equals one pump bad. (this was part of this morning project for me BTW)

[rkreigh]

if anyone needs pumps, I gotz em cheap. I upgraded on the LSV and my fresh stockers are no longer needed.

[Young1]

Mike,
We can help but we need to know the fuel rail pressures. Get a gauge set from harbor freight. Read the stickies on fuel pumps here on the forum. I think you have a cracked hose or fitting in the tank. We need more info sir.

[jss06c6]

As others have said, very likely pump 1. The LT-5 runs on both pumps until temp comes up and engine switches to closed loop, then it turns off #2 and only runs on #1 unless demanded at WOT by ECM. Make sure you check the bulkhead connector as well (for corrosion) when you have the assembly out.

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