1999 Chevy S-10 new fuel pump have 5 volts at pump but pump will not run

Asked by Guru95VWXH Jan 02, 2021 at 05:00 PM about the 1999 Chevrolet S-10 LS Extended Cab RWD

Question type: Maintenance & Repair

new fuel pump and have 5 volts at pump but fuel pump will not come on and
run what else could be the problem?

1 Answer


When you first turn on the key, can you hear initial prime? Battery has a full charge and connections all good? What color wire were you checking for voltage, at the pump? The gray wire is voltage and black wire is ground. If you unplug fuel pump relay, use jumper wire between cavities 3 and 5, note the diagram, the pump should run. You don't even need to use the key. Just curious, engine cranking, you have spark at the plugs and fuel injector pulse? Any applicable trouble codes?

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