GM Bonneville/Eighty Eight/LeSabre 1986-1999

Fuel Pressure Regulator

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REMOVAL & INSTALLATION



See Figures 1, 2, 3, 4, 5 and 6

  1. Relieve fuel system pressure. Disconnect the negative battery cable.
  2.  
  3. Clean dirt and grease from the regulator retaining ring.
  4.  
  5. If equipped with a bolt on-type pressure regulator, remove the fuel return line from the return tube by squeezing the tab and pulling it off.
  6.  
  7. Disconnect the vacuum line from the regulator.
  8.  
  9. If equipped with a bolt on-type regulator, perform the following:
    1. Remove the regulator attaching bolt(s)/screw(s) from the bracket.

      Click image to see an enlarged view

      Fig. Fig. 1: Remove the 2 fuel pressure regulator-to-rail attaching bolts (fuel rail removed from vehicle)

    2.  

  10.  
  11. If equipped with a snapring-type regulator, perform the following:
    1. Remove the snapring from the regulator.
    2.  

  12.  
  13. Wrap a towel around the regulator to catch any fuel that may escape. Remove the regulator from the fuel rail using a twisting and pulling motion.
  14.  



Click image to see an enlarged view

Fig. Fig. 2: ... then remove the regulator by using a twisting and pulling motion

  1. If equipped with a bolt on-type pressure regulator, disconnect the fuel return tube assembly from the pressure regulator.
  2.  
  3. Cover all openings with masking tape to prevent dirt entry. If the regulator is being reused, inspect the filter screen, if equipped, for contamination. If contamination exists, replace the filter screen.
  4.  



Click image to see an enlarged view

Fig. Fig. 3: Exploded view of the regulator mounting on the fuel rail - VIN K engine shown



Click image to see an enlarged view

Fig. Fig. 4: Some regulators, such as this 1995 VIN L, are secured with a mounting bolt

  1. If further disassembly is necessary, perform the following:
    1. Remove the small regulator O-ring.
    2.  
    3. Remove the regulator filter screen.
    4.  
    5. Remove the large regulator O-ring.
    6.  
    7. Remove the O-ring back-up.
    8.  

  2.  



Click image to see an enlarged view

Fig. Fig. 5: Exploded view of the regulator housing (1), small O-ring (2), filter screen (3), large O-ring (4), O-ring back-up (5), regulator (6) and snapring (7)

To install:
  1. If the regulator was disassembled, perform the following:
  2.  

Lubricate all O-rings with clean engine oil prior to assembly.

    1. Install a new regulator O-ring back-up and large O-ring.
    2.  
    3. Install the regulator filter screen.
    4.  
    5. Install the small regulator O-ring.
    6.  

  1. If the regulator is not being replaced with a new one, lubricate new O-rings with clean engine oil, then position them on the old regulator.
  2.  



Click image to see an enlarged view

Fig. Fig. 6: If the regulator is not being replaced, remove and discard the old O-rings

  1. If necessary, connect the fuel return tube to the pressure regulator and secure with the retaining nut. Tighten the nut to 13 ft. lbs. (17 Nm).
  2.  
  3. Install the regulator into the regulator housing and seat with even pressure.
    1. Install the snapring or retaining bolt(s)/screw(s), as applicable.
    2.  

  4.  
  5. Attach the vacuum line to the regulator.
  6.  
  7. If removed, connect the fuel return tube to the pressure regulator.
  8.  
  9. Connect the negative battery cable.
  10.  
  11. Turn the ignition switch ON and OFF to allow fuel pressure back into system. Check for leaks.
  12.  

 
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