GM Lumina/Grand Prix/Cutlass Supreme/Regal 1988-1996

Fuel Pressure Regulator



See Figure 1

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Fig. Fig. 1: The fuel pressure regulator is mounted on the fuel meter body assembly

  1. Properly relieve the fuel system pressure. If not already done, disconnect the negative battery cable.
  3. Remove the air intake duct (TBI bonnet).
  5. Unfasten the 4 pressure regulator retaining screws, while keeping the pressure regulator compressed by maintaining pressure on the regulator cover.

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

  1. Carefully remove the pressure regulator cover, then remove the pressure regulator spring, spring seat and pressure regulator diaphragm assembly.

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

  1. Check the pressure regulator seat in the fuel meter body cavity for pitting, nicks or irregularities. Use a magnifying glass if necessary. If any of the above is present, the whole fuel body casting must be replaced.

To install:
  1. Install the new pressure regulator diaphragm assembly making sure it is seated in the groove in the fuel meter body.
  3. Install the regulator spring seat and spring into the cover assembly.
  5. Position the cover assembly over the diaphragm, while aligning the mounting holes. Be sure to use care while installing the pressure regulator to prevent misalignment of the diaphragm and possible leaks.

Make sure the hold the pressure regulator cover in place to prevent the diaphragm from slipping out of the groove.

  1. Coat the 4 regulator retaining bolts with Loctite®262 or equivalent suitable thread sealer, then tighten the screws to 21 inch lbs. (2.4 Nm).
  3. Connect the negative battery cable.
  5. With the engine OFF , check to see that the accelerator pedal is free by depressing the pedal to the floor, then releasing it.
  7. Turn the ignition switch to the ON position for 2 seconds, then turn OFF for 10 seconds. Again turn the switch ON and check for fuel leaks.
  9. Install the air intake duct (TBI bonnet) with the gasket.