Fuel Problems 1997 GMC Sierra

[reay57]

Hi i am new to this forum and i thank you in advance for your help
i currently have a 1997 GMC Sierra k2500 with a vortec 350 the other day i pull into work put the truck in park and it dies and hasn't started since. the fuel pump was not firing up so i replaced the fuel pump relay, nothing then i replaced the fuel pump and sending unit and wiring at the fuel pump once again nothing

[envoyxuv]

This may be a silly question, but to cover the basics, did you check the fuel pump fuse?

[reay57]

ok this is what i got done today i popped the top of the relay off i can get good fuel pressure by manually engaging the relay. Thought it would start from the gas i forced up, nothing so i checked for spark i have no spark. Ignition Module?? pick up? it is a brand new relay by the way

[sector95]

Just some thoughts..... relays use a power source to control the flow of power to a componenet (fuel pump in this case); relays are used typically as switches to operate high-draw components. A wiring diagram would help a lot in your trouble shooting....I would find out if the relay is getting switching power to close it so power flows to your fuel pump. If the relay and pump are new and you can get the pump to run by manually engaging the relay, then it would seem the relay is not getting its control power. I would check the fuse panel....check them all and also check any fuses in the relay control box in the engine bay. There may be other components/sensors powered when the fuel pump relay is energized closed or powered by the control power circuit of the relay.


Good luck...

Mike
98Sierra