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Where the fuel relay is on a 92 GMC topkick

No power to fuel pump

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SOURCE: Where the fuel relay is on a 92 GMC topkick don't have power to fuel pump

I don't know for sure but very commonly GM has located relays up along the firewall.

Posted on May 17, 2017


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Where the fuel relay is on a 92 GMC topkick don't have power to fuel pump

I don't know for sure but very commonly GM has located relays up along the firewall.

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Before going there, check your INERTIA SWITCH (INTERTIAL CUTOFF SWITCH). A small accident or a sharp bump can cause the cutoff switch to trip. The switch is located adjacent to the passenger side rear shock tower, and there is a pushbutton to reset (on most Topkick tucks). Carbureted Topkick trucks do not have cutoff switches, and some custom trucks have the inertia switch relocated.

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I'm not sure of vin? My info shows oil pressure switch in parallel with fuel pump relay, so if that switch is functional and has voltage, once you crank it enough to bring up oil pressure, the pump should run even without the relay. The voltage for load side of relay and oil pressure switch comes from ecm B fuse. The voltage for control side of fuel pump relay comes from pcm.
Any other issues besides fuel? Engine cranking do you have spark at the plugs and fuel injector pulse? If your missing the last two, have to check for rpm signal.

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