To troubleshoot a non-working fuel pump in a Pontiac Sunbird, start by checking the fuel pump fuse and relay for any signs of damage or failure. Next, listen for a humming sound from the fuel tank when the ignition is turned on, which indicates the pump is operating. If there's no sound, test for power at the fuel pump connector using a multimeter; if there's power but the pump doesn’t activate, it may need replacement. Additionally, inspect the fuel lines for clogs and ensure the fuel filter isn't blocked, as these can impede fuel flow.
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