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To diagnose fuel pump problems in a 1994 Toyota Corolla, first check for fuel flow by removing the fuel line at the engine and cranking the ignition; if no fuel comes out, the pump may be faulty. Next, listen for a humming sound from the fuel tank when the ignition is turned on, indicating the pump is working. Additionally, test the fuel pump relay and fuses for any electrical issues, as these can prevent the pump from operating. If these steps do not reveal the issue, consider using a fuel pressure gauge to measure the pump's output pressure against the manufacturer's specifications.

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