"I have a 1987 GMC
Sierra 3500 5.7 . with the gauges fuse in and I turn the key the fuel pump comes on like it should"
Ok, got that,
"but after the time it should run I hear a click under the hood,sounds like at the carrb area, then the fuel pump keeps running and wount shut off"
ok, do you mean after you turn off the engine the fuel pump keeps running? running with the key in the off position? Then when you pull the gage/idle fuse the fuel pump turns off?
the only place where I see the gage/idle fuse circuit comes close to the fuel pump relay circuit is in the hot fuel handling module
is the click like a relay click or what? fuel pump relay on the firewall?