GM Cavalier/Sunbird/Skyhawk/Firenza 1982-1994

Fuel Pressure Regulator

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REMOVAL & INSTALLATION



See Figure 1

  1. Properly relieve the fuel system pressure.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Remove the air cleaner and gasket, then discard the gasket.
  6.  
  7. While keeping the pressure regulator compressed, unfasten the four pressure regulator attaching screws.
  8.  



Click image to see an enlarged view

Fig. Fig. 1: Exploded view of the pressure regulator assembly


CAUTION
The pressure regulator contains a large spring under heavy compression. Use care when removing the screws to prevent personal injury.

  1. Remove the pressure regulator cover assembly.
  2.  
  3. Remove the spring seat and the pressure regulator diaphragm assembly.
  4.  

To prevent leaks, the pressure regulator diaphragm assembly must be replaced whenever the cover is removed.

  1. Inspect the pressure regulator valve seat for pitting, nicks or irregularities.
  2.  

To install:
  1. Install the pressure regulator diaphragm assembly, making sure it is seated in the groove in the fuel meter body.
  2.  
  3. Install the regulator spring seat and spring into the cover assembly.
  4.  
  5. Hold the cover in place to prevent the diaphragm from slipping out of the groove, install the cover assembly over the diaphragm.
  6.  
  7. While maintaining pressure on the regulator spring, install the four screw assemblies that have been coated with Loctite® 262, or equivalent thread locking compound. Tighten the screws to 21 inch lbs. (2.4 Nm).
  8.  
  9. Tighten the fuel filler cap, if loosened during fuel pressure relief procedure.
  10.  
  11. Connect the negative battery cable, then with the engine OFF , check to see that the accelerator pedal is free by depressing, then releasing it. Turn the ignition switch to the ON position for 2 seconds, then turn to the OFF position for 10 seconds. Again turn the switch to the ON position and check for fuel leaks.
  12.  
  13. Install the air cleaner assembly and gasket.
  14.  

 
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