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Home >> Buick >> 2005 >> LeSabre Custom, 4T65E/MN3 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Introduction >> Repair Instructions >> Fuel Rail Assembly Replacement (VIN K) >> Installation Procedure
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Installation Procedure

CAUTION: In order to reduce the risk of fire and personal injury that may result from a fuel leak, always install the fuel injector O-rings in the proper position. If the upper and lower O-rings are different colors (black and brown), be sure to install the black O-ring in the upper position and the brown O-ring in the lower position on the fuel injector. The O-rings are the same size but are made of different materials.
NOTE:
  • Use care when servicing the fuel system components, especially the fuel injector electrical connectors, the fuel injector tips, and the injector O-rings. Plug the inlet and the outlet ports of the fuel rail in order to prevent contamination.
  • Do not use compressed air to clean the fuel rail assembly as this may damage the fuel rail components.
  • Do not immerse the fuel rail assembly in a solvent bath in order to prevent damage to the fuel rail assembly.
    Fig 1: Identifying Fuel Rail (Exploded View)
    GM537319Courtesy of GENERAL MOTORS CORP.
  1. The O-rings must be replaced on all components that are serviced.
  2. Lightly oil the fuel injector O-rings with clean motor oil.
  3. Place the fuel rail assembly on the intake manifold.
  4. Seat the fuel injectors by HAND.
  5. Install the fuel rail hold down bolts.

    Tighten:  Torque the fuel rail hold-down bolts to 10 N.m (89 lb in).

    6. Fig 2: View Of Fuel Injector Electrical Connectors
    GM198402Courtesy of GENERAL MOTORS CORP.
  6. Connect the fuel injector electrical connectors to the fuel injectors.
    7. Fig 3: Disconnecting/Reconnecting Fuel Feed & Fuel Return Pipes (L36)
    GM32409Courtesy of GENERAL MOTORS CORP.
  7. Connect the fuel feed (1) and return (2) pipes to the fuel rail tubes. Refer to Quick Connect Fitting(s) Service (Plastic Collar) .
    8. Fig 4: View Of Vacuum Line At Pressure Regulator
    GM155470Courtesy of GENERAL MOTORS CORP.
  8. Connect the vacuum line to the fuel pressure regulator.
  9. Install the ignition coil wires.
  10. Tighten the fuel fill cap.
  11. Connect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
  12. Inspect for leaks.
    1. Turn ON the ignition for 2 seconds.
    2. Then OFF the ignition for 10 seconds.
    3. Turn ON the ignition.
    4. Inspect for fuel leaks.
  13. Install the fuel injection sight shield. Refer to Fuel Injector Sight Shield Replacement (L36) in Engine Mechanical.
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