2004 Ford Mustang Fuel Pump Relay Location, Troubleshooting: Symptoms Of A Failing Valve. About featured snippets•FeedbackPeople also askYou will see more English now.How do you know if your check valve is bad?What causes fuel pump check valve failure?How do you test a fuel pump check valve?Does my fuel pump need a check valve?Feedback 2004 G35 Fuel Pump, Bad Fuel Pump Check Valve Symptoms. Stalling. If the fuel pump's check valve is bad, the vehicle may start properly, but stall as soon as the fuel pump turns off . 2004 Grand Prix Fuel Pump, Does this mean my fuel pump check valve is bad? If so, I .. Aug 12, 2003 — 1. the fuel pump check valve is bad 2. the injectors aren't leaking 3. the charcoal cannister either isn't working, or only vents above . 2004 Honda Pilot Fuel Pump Location, Fix for bad fuel pump check valve. Mar 8, 2012 — I had confirmed that the fuel pump check valve had failed by doing several pressure tests on the fuel lines. Fuel pump pressures continue to . 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