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Home >> Cadillac >> 2008 >> XLR Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 4.6L (LH2) - Introduction >> Repair Instructions >> Fuel Injection Fuel Rail Assembly Replacement >> Removal Procedure
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Removal Procedure

NOTE:
  • Remove the fuel rail assembly carefully in order to prevent damage to the injector electrical connector terminals and the injector spray tips. Support the fuel rail after the fuel rail is removed in order to avoid damaging the fuel rail components.
  • Cap the fittings and plug the holes when servicing the fuel system in order to prevent dirt and other contaminants from entering open pipes and passages.
    Fig 1: View Of Fuel Rail Quick-Connect Fitting, Fuel Feed Hose & Chassis Fuel Feed Pipe
    GM931736Courtesy of GENERAL MOTORS CORP.
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  2. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement .
  3. Relieve the fuel system pressure. Refer to Fuel Pressure Relief (With CH 48027)  and/or Fuel Pressure Relief (Without CH 48027) .
  4. Clean the fuel rail assembly with a spray type engine cleaner, GM X 30A or equivalent, if necessary. Follow the package instructions. Do not soak the fuel rail in liquid cleaning solvent.
  5. Disconnect the fuel feed and return pipes (2, 3) from the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .
  6. Disconnect the positive crankcase ventilation (PCV) air tube from the cam cover.
    7. Fig 2: View Of Fuel Injector & Electrical Connectors
    GM490817Courtesy of GENERAL MOTORS CORP.
  7. Disconnect the fuel injector electrical connectors (1) from each fuel injector (2).
    8. Fig 3: View Of Intake Manifold Stud Engine Wiring Harness Ground
    GM927871Courtesy of GENERAL MOTORS CORP.
  8. Remove the engine wiring harness from the fuel rail stud.
    9. Fig 4: View Of Right Side Fuel Injectors Engine Wiring Harness Connectors
    GM927838Courtesy of GENERAL MOTORS CORP.
  9. Remove the engine wiring harness from the clips.
  10. Lay the harness aside.
    11. Fig 5: View Of Fuel Rail & Injector Assembly
    GM928165Courtesy of GENERAL MOTORS CORP.
  11. Remove the fuel rail attaching studs.
  12. Remove the fuel rail.
  13. Remove the injector lower O-ring seal from the spray tip end of each injector.
  14. Discard the O-ring seals.
  15. If replacing the fuel rail, remove the fuel injectors. Refer to Fuel Injector Replacement .
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