I have a 2003 GMC Sierra 2500hd. My fuel pump will not turn on, I have replaced it, tested it and the pump works. I have power to the harness and the fuses and relays are good. Pump will not turn on.

Asked by Sep 10, 2014 at 03:30 PM about the 2003 GMC Sierra 2500HD SLT 4WD Extended Cab LB HD

Question type: Maintenance & Repair

I checked the grounds and voltage they
both seem good. I also swapped relays and
they are good. I'm stumped.

2 Answers


check your ecm its a a problem in your computer is not telling your fuel pump to turn on

1 of 1 people found this helpful.

my father had a 2001 and he kept having problems with the fuel pump ended up being a ground wire on the pump wire harness

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