![]() If you don’t own a fuel pressure gauge and want to do a DIY test, perform this on a cold start first thing in the morning: But often the technician will see a total loss of fuel pressure due to a leaking check valve. The technician check fuel pressure the next morning and records the pressure reading. Then the engine is shut down and left overnight. The technician attaches fuel pressure gauge to the fuel rail and starts the engine. The most reliable test for a check valve is to do a leak down test. The check valve is located in the fuel pump and cannot be replaced separately. That requires the fuel pump to run for longer periods and results in extended cranking. ![]() When pressure falls, the fuel pump must refill the fuel rail and build adequate fuel pressure to work the fuel injectors. overnight is often a sign that the check valve has failed. A drop in fuel pressure in excess of 5-psi. Turbine style fuel pump showing the turbine, motor and check valve
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