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Where is the fuel pump reset switch on a 1988 gmc suburban?

There's no fuel pump reset switch on a 1988 GMC Suburban (or virtually any vehicle). Fuel pumps don't have a reset switch in the same way some other systems might.

If you're having fuel pump problems, the issue is likely a malfunctioning pump, a bad fuel pump relay, a blown fuse, wiring problems, or perhaps even a problem with the fuel pump's power supply. You'll need to diagnose the specific problem rather than look for a reset switch.