Nissan 17040-5S105 Complete Fuel Pump

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Relieve the fuel pressure, then on Frontier and Xterra models, remove the fuel tank, and on Pathfinder models, remove the rear seat and the fuel pump/fuel level sending unit access cover, disconnect the electrical connector from the fuel pump/sending unit assembly, detach the fuel feed line and return lines and remove the fuel pump/sending unit mounting screws, carefully maneuver the fuel pump/sending unit assembly out of the tank, disconnect the fuel pump electrical connector, disconnect the fuel hose from the fitting on the fuel pump, depress the locking pawl and separate the fuel pump and bracket from the fuel level sending unit, check the strainer for contamination and replace it if necessary, installation of the fuel pump to the sending unit assembly is the reverse of removal, clean the fuel pump mounting flange and the tank mounting surface and seal ring groove, position a new 0-ring around the opening in the fuel tank and guide the fuel pump/sending unit assembly into the tank, make sure the fuel lines are facing in their original position, then tighten the fuel pump/sending unit mounting screws securely, connect the fuel lines, and on Pathfinder and Xterra models, connect the electrical connector, install the access cover and the rear seat, and on Frontier models, install the fuel tank.

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.