Nissan 17042-4S400 Complete Fuel Pump

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If you suspect insufficient fuel delivery, first inspect all fuel lines to ensure that the problem is not simply a leak in a line and check that there is adequate fuel in the fuel tank. Set the parking brake and have an assistant turn the ignition switch to the ON position while you listen to the fuel pump (inside the fuel tank). If the fuel pump is operating, remove the fuel line from the fuel filter and install a T-fitting between the fuel filter and the fuel rail, connect a fuel pressure gauge to the T-fitting, turn the ignition switch On and compare the pressure reading with the key On, engine Off value listed in the Specifications. Start the engine and allow it to idle, compare the pressure reading with the engine running value listed in the Specifications, disconnect and plug the vacuum hose from the fuel pressure regulator and the pressure should increase to the value recorded. If the pressure readings are correct, the system is operating properly. If the fuel pressure is not within specifications, check for vacuum to the fuel pressure regulator, check for a restriction in the fuel filter or fuel line, start the engine and slowly pinch the return hose shut, turn the engine Off and place the ignition switch in the On(engine not running) position and monitor the pressure on the gauge for approximately five minutes. After completing the testing, relieve the fuel pressure and remove the fuel pressure gauge.

To install the fuel pump/sending unit assembly, follow these steps: Clean the fuel pump mounting flange and the tank mounting surface and seal ring groove. Position a new O-ring around the opening in the fuel tank. Guide the fuel pump/sending unit assembly into the tank, ensuring the fuel lines are facing their original positions. Tighten the fuel pump/sending unit mounting screws securely.