Fuel Pump Diagnostic Guide: For Electric Fuel Injection
Quickly and accurately determine the exact cause, of electric fuel system malfunctions.
To diagnose a fuel pump, first listen for the pump’s hum when the ignition is turned to the “on” position. If you don’t hear it, check the fuel pump fuse and relay. If those are good, use a fuel pressure gauge to test the pressure; low pressure indicates a faulty pump, while good pressure but no starting can point to an electrical issue.
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