Quest 1995-1996

Fuel Pressure Regulator

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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.

  1. Relieve the fuel system pressure. Please refer to Relieving Fuel System Pressure for the procedure.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Disconnect the fuel pressure regulator-to-intake manifold vacuum hose from the regulator.
  6.  
  7. Loosen the fuel hose clamp and disconnect the hose from the regulator. Plug the hose to prevent fuel leakage.
  8.  
  9. Remove the two fuel pressure regulator screws and remove the regulator.
  10.  

To install:

  1. The installation is the reverse of removal, but please note the following important steps.
  2.  
  3. When installing the fuel pressure regulator, use a new O-ring.
  4.  
  5. After installation, 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.
  6.  
  7. 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. After removing the vacuum hose, disconnect the fuel hose from the regulator



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    Fig. Fuel pressure regulator

  8.  

Testing



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.

  1. Relieve the fuel system pressure. Please refer to Relieving Fuel System Pressure for the procedure.
  2.  
  3. Install an in-line fuel pressure gauge between the in-line fuel filter and the engine.
  4.  
  5. Start and run the engine for ten seconds.
  6.  
  7. Turn the engine OFF for ten seconds.
  8.  
  9. Start the engine again, and run it for ten seconds.
  10.  
  11. Turn the engine OFF .
  12.  
  13. Disconnect the fuel pressure regulator-to-intake manifold vacuum hose from the regulator.
  14.  
  15. Connect a hand vacuum pump to the fuel pressure regulator.
  16.  
  17. While observing the fuel pressure gauge, apply 20 in. Hg (508mm Hg) of vacuum to the regulator. The fuel pressure should decrease.
  18.  
  19. If the fuel pressure does not decrease, or if the fuel pressure regulator will not hold vacuum, replace the regulator.

    Click image to see an enlarged view

    Fig. Using a hand vacuum pump to test the fuel pressure regulator

  20.  

 
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