Mechanics

CHEVY POWER TO FUEL DELIVERY SYSTEM

1991 Chevrolet Silverado

Electrical problem
1991 Chevy Silverado V8 Four Wheel Drive Manual

My problem is that the fuel pump is not getting any power when plugged into the wire harness at the pump. When unplugged I test that there is a full 12 volts going directly to the pump, but when plugged back in it cuts down to 0 volts. I have replaced the pump and the fuel pump relay. The pump fuse is good as is the grounding at the fuel tank. I have come to a dead end!
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Ghosley
August 10, 2008.




Have helper crank engine over and recheck the power.
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Tiny
Rasmataz
Aug 10, 2008.
I tried that a couple times, testing all wires in the pump relay harness

Could it be the ignition switch?

Tiny
Ghosley
Aug 10, 2008.
The computer energizes the fuel pump relay-when the engine fires up-the oil pressure sending unit powers the fuel pump


http://www.2carpros.com/forum/automotive_pictures/12900_oil_sending_unit_and_fuel_pump_circuit_66.gif



Check the inline fuse 20amp see item no.15 below


http://www.2carpros.com/forum/automotive_pictures/12900_fuse_7.jpg


Tiny
Rasmataz
Aug 11, 2008.

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