Question about 1991 Chevrolet C1500
The wiring harness for the fuel pump has three wires to it, how many wires should show voltage when the key is in the on position
Hello, Only 2 wires show be hot when fuel pump power is supplied. I think that the gray wire is the power side so ck that wire to ground. Also, fuel pump power is supplied from your oil pressure switch and the fuel pump relay only supplies power for a few seconds until the truck is started. Keep in mind that the fuel pump will only run a few seconds by just turning the switch on. If you want the pump to stay on without the motor running , you will have to by-pass the fuel pump relay.
I hope this will help.
Posted on Feb 06, 2009
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