Quest 1995-1996

Fuel Pump

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Removal & Installation



Specific to:

Mercury Villager 1993-2000

Nissan Quest 1993-2000


CAUTION
Observe all applicable safety precautions when working around fuel. Whenever servicing the fuel system, always work in a well ventilated area. Do not allow fuel spray or vapors to come in contact with a spark or open flame. Keep a dry chemical fire extinguisher near the work area. Always keep fuel in a container specifically designed for fuel storage; also, always properly seal fuel containers to avoid the possibility of fire or explosion.

The fuel pump and fuel tank sending unit are removed as an assembly.

  1. Remove the fuel tank. Please refer to Fuel Tank, Removal and Installation for the procedure.
  2.  
  3. Clean the area around fuel pump.
  4.  
  5. Remove the six fuel pump bolts.
    WARNING
    The fuel pump and fuel tank sending unit assembly must be tilted to remove it from the fuel tank. Do not lift the assembly straight out of the tank, or damage may occur to the sending unit.

  6.  
  7. Lift the fuel pump and fuel tank sending unit assembly from the fuel tank and discard the gasket.
  8.  

To install:

  1. Install a new gasket and carefully lower the fuel pump and fuel tank sending unit assembly into the fuel tank.
  2.  
  3. Install the six bolts and tighten them to 18-21 inch lbs. (2.0-2.4 Nm).
  4.  
  5. Install the fuel tank.
  6.  
  7. Add a minimum of 10 gallons (38 liters) of clean fuel to the tank.
  8.  
  9. Cycle the ignition switch several times from the OFF to ON positions without starting the engine, allowing five seconds at each position, to build fuel pressure within the system. Check for fuel leaks.
  10.  
  11. Start the engine and recheck for fuel leaks. Road test the vehicle and check for proper operation.

    Click image to see an enlarged view

    Fig. Fuel pump bolt location

  12.  

Testing



Specific to:

Mercury Villager 1993-2000

Nissan Quest 1993-2000

If there is no fuel pressure or the pressure is low, and the in-line filter is not restricted, check the fuel pump as follows:

  1. Raise and safely support the rear of the vehicle securely on jackstands.
  2.  
  3. Disconnect the fuel pump electrical connector.
  4.  
  5. Connect the positive lead of a voltmeter to the light green and red wire terminal of the harness connector.
  6.  
  7. Connect the negative voltmeter lead to the negative battery terminal or chassis ground.
  8.  
  9. Without starting the engine, turn the ignition switch on and observe the voltmeter reading within five seconds. If the voltage is greater than 10 volts, proceed with the next step. If the voltage is less than 10 volts, check fuel pump fuse, relay, and related circuits, and repair as needed.
  10.  
  11. Turn the ignition switch OFF and disconnect the voltmeter.
  12.  
  13. Connect ohmmeter leads between the black and white wire terminal of the harness connector and the negative battery terminal or chassis ground.
  14.  
  15. Observe the ohmmeter reading. If the reading is less than 5 ohms, proceed with the next step. If the reading is greater than 5 ohms, check the inertia fuel shutoff switch and related circuit, and repair as needed.
  16.  
  17. Connect ohmmeter leads between the light green and red wire terminal and the black and white wire terminal of the fuel pump connector.
  18.  
  19. Observe the ohmmeter reading. The reading should be 0.2-5.0 ohms. If not, replace the fuel pump.
  20.  
  21. If the fuel pump voltage supply, ground circuit, and resistance are within specifications, but the fuel pressure is below specifications, replace the pump.

    Click image to see an enlarged view

    Fig. Fuel pump harness connector location-1993-97 vehicles



    Click image to see an enlarged view

    Fig. Ohmmeter connections for fuel pump testing-1993-97 vehicles



    Click image to see an enlarged view

    Fig. Fuel pump harness connector location-1998-00 vehicles



    Click image to see an enlarged view

    Fig. Ohmmeter connections for fuel pump testing-1998-00 vehicles

  22.  

 
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