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After replacing the fuel pump in a 1999 GMC Safari and the vehicle won't start, first check for proper fuel pressure using a fuel pressure gauge to ensure the pump is functioning correctly. Next, verify that all electrical connections, including the fuel pump relay and fuses, are secure and operational. Additionally, check for any air in the fuel line and ensure the fuel filter is not clogged. Finally, ensure the vehicle has spark and that the ignition system is working properly.

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4d ago

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