Where is a fuel pump reset switch for a 1999 gmc sierra c1500?
Where is a fuel reset switch
You don't have one. Check the fuel pump relay for voltage and ground. Unplug the pump relay, on the switch side of relay, on the right in diagram, use a proper jumper wire between the two terminals, the fuel pump should run, no need to use key. As you can see that top terminal is hot all the time and fuse protected. I don't know liter size of your engine? Also, engine cranking, do you have spark at the plugs and fuel injector pulse?