Genuine Nissan Quest Fuel Pump

Nissan Quest Fuel Pump Parts Questions & Answers

• Fuel Pump Assembly
  17042-6B726
  Q: How to perform a Fuel Pump and fuel pressure test?

  A: To perform the fuel pressure test, you'll need a fuel pressure gauge capable of measuring high fuel pressure and an adapter set for the fuel injection system being tested. Check there's adequate fuel in the tank. Ensure the fuel pump runs by removing the fuel filler cap, turning the ignition key to the On position, and listening for a whirring sound from the fuel filler opening. Relieve the fuel system pressure, install a fuel pressure gauge and adapter between the fuel filter and the rear fuel rail. With the ignition On and the air conditioning Off, the fuel pump should run, and pressure should register on the gauge. Start the engine and idle, then disconnect the vacuum hose from the Fuel Pressure Regulator to see if the pressure increases. If the pressure isn't within specifications, check for vacuum to the fuel pressure regulator, for a pinched or clogged fuel return hose, or replace the regulator. Monitor the pressure on the gauge with the engine Off and the ignition On; if the pressure changes too much, an injector may be leaking or the in-tank fuel pump leakdown valve might be faulty. After testing, relieve the fuel pressure and remove the gauge. If the pump doesn't turn on, check the fuel pump fuse. If fuses are intact, check for battery voltage at the fuel pump harness connector and for continuity to ground. If there's no voltage, check the fuel pump relay. If the relay functions, probe the relay connector with a test light after turning the ignition On; the light should illuminate briefly, indicating the ground circuit from the PCM works. If the relay connector has the correct signals, check the relay-to-fuel pump harness circuit for issues.
• Fuel Pump Assembly
  17042-0B025
  Q: How do you remove the Fuel Pump from a Nissan Quest and relieve the fuel pressure?

  A: Relieve the fuel pressure and remove the Fuel Tank from the vehicle. Detach the fuel feed line and return lines and the mounting bolts from the fuel pump module. On later models, quick-disconnect fittings are used on the fuel pump and fuel tank lines. These fittings require a special tool to disconnect. The tool is available from auto parts stores and dealer service departments. Follow the instructions included with the tool. Lift the fuel pump/sending unit assembly out of the tank. Carefully angle the fuel pump module out of the fuel tank without damaging the fuel level sending arm and float. Caution: The fuel level float and sending unit are delicate. Don't bump or bend them during removal or the accuracy of the sending unit may be affected. Inspect the condition of the O-ring around the opening of the tank. If it is dried, cracked or deteriorated, replace it. Remove the strainer from the lower end of the fuel pump. If it's dirty, remove it and clean it with carburetor cleaner spray. If it's too dirty to be cleaned, replace it. Note: Most new fuel pump assemblies come equipped with a new strainer. Loosen the fuel pump mounting clamp bolt. To separate the fuel pump from the assembly, remove the fuel hose lower clamp and disconnect the electrical connector from the fuel pump. Installation of the fuel pump to the sending unit is the reverse of removal. Clean the fuel pump mounting flange and the tank mounting surface and seal the ring groove. Apply a thin coat of heavy grease to the new seal ring to hold it in place during assembly. Position the O-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 module bolts securely. Install the fuel tank.