Nissan Maxima 1993-1998 Repair Guide

Fuel Pressure Regulator

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REMOVAL & INSTALLATION



VG30E Engine

See Figures 1, 2 and 3

The pressure regulator is always located on the fuel return side of the fuel injection rail and is attached to the right rear of the fuel rail assembly, at the right rear corner of the intake manifold.



Click image to see an enlarged view

Fig. Fig. 1: The pressure regulator can be found attached to the fuel rail


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. Disconnect the negative battery cable and relieve the fuel pressure.
  2.  
  3. Disconnect the air intake duct from the dual duct housing.
  4.  
  5. Unplug the electrical connectors from the throttle body, the step motor AAC valve and the exhaust gas temperature sensor.
  6.  
  7. Disconnect and label the hoses from the rocker arm cover, the throttle body, the step motor AAC valve, the EGR control valve and the air cut valve.
  8.  
  9. If the spark plug wires are in the way, disconnect them and move them aside. Disconnect the accelerator cable from the throttle body.
  10.  
  11. Remove the upper intake manifold collector-to-intake manifold bolts, in sequence, and lift the assembly from the intake manifold. Discard the gasket.
  12.  
  13. Remove the lower intake manifold collector-to-intake manifold bolts, in sequence, and lift the assembly from the intake manifold. Discard the gasket.
  14.  
  15. Remove the fuel injector assembly by performing the following procedure:
    1. Disconnect the electrical connectors from the fuel injectors.
    2.  
    3. Disconnect the fuel injector assembly from the fuel lines.
    4.  
    5. Remove the fuel rail-to-cylinder head bolts.
    6.  
    7. Remove the fuel rail assembly from the engine.
    8.  

  16.  
  17. Remove the fuel pressure regulator from the fuel rail assembly.
  18.  



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Fig. Fig. 2: After the two bolts are removed, pull the regulator from the fuel rail

To install:


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Fig. Fig. 3: Always install a new O-ring when removing the fuel pressure regulator

  1. Clean the gasket mounting surfaces.
  2.  
  3. Install the fuel injector assembly by performing the following procedure:
    1. Install the fuel rail assembly to the engine.
    2.  
    3. Install the fuel rail-to-cylinder head bolts and torque the bolts to 1.8-2.4 ft. lbs. (2.5-3.2 Nm).
    4.  
    5. Connect the fuel injector assembly to the fuel lines.
    6.  
    7. Connect the electrical connectors to the fuel injectors.
    8.  

  4.  

  1. Use a new gasket and install the lower intake manifold collector; torque the lower intake manifold collector-to-intake manifold bolts, in 2-3 steps, in sequence, to 13-16 ft. lbs. (18-22 Nm).
  2.  
  3. Use a new gasket and install the upper intake manifold collector-to-intake manifold; torque the bolts to 5.1-5.8 ft. lbs. (7-8 Nm).
  4.  
  5. Connect the spark plug wires, if disconnected. Connect the accelerator cable to the throttle body.
  6.  
  7. Connect the hoses to the rocker arm cover, the throttle body, the step motor AAC valve, the EGR control valve and the air cut valve.
  8.  
  9. Connect the electrical connectors to the throttle body, the step motor AAC valve and the exhaust gas temperature sensor.
  10.  
  11. Connect the negative battery cable.
  12.  
  13. Start the engine and check for leaks.
  14.  

Keep in mind that the engine may take longer to start, since the fuel system has to pressurize. Be sure the battery is in good condition.

VE30DE and VQ30DE Engines

See Figure 4

The fuel pressure regulator is attached to the fuel rail, near the throttle body, below the upper intake manifold collector.


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.
  2.  
  3. For safety purposes, disconnect the negative battery cable.
  4.  
  5. Disconnect the vacuum hose attached to the regulator.
  6.  
  7. Disconnect the fuel hose from the regulator. Use a rag to catch any excess fuel.
  8.  
  9. Remove the retainer screws that hold the regulator to the fuel rail.
  10.  



Click image to see an enlarged view

Fig. Fig. 4: Fuel pressure regulator detail. Always replace the O-ring when installing the regulator

  1. Place a rag under the regulator to contain any excess fuel, then pull it away from the fuel rail.
  2.  

To install:
  1. Install new O-rings on the regulator.
  2.  
  3. Lightly lubricate the O-rings and push the regulator into the fuel rail.
  4.  
  5. Install the retainer screws, and attach the hoses to the regulator.
  6.  
  7. Connect the negative battery cable, and start the engine and check for any leaks.
  8.  

Keep in mind that the engine may take longer to start, since the fuel system has to pressurize. Be sure the battery is in good condition.

 
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