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Home >> Hummer >> 2009 >> H3 Alpha >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 5.3L - Introduction >> Repair Instructions >> Fuel Injection Fuel Rail Assembly Replacement >> Removal Procedure
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Removal Procedure

NOTE: An 8-digit identification number is located on the fuel rail. Refer to this model identification number if servicing or part replacement is required.
    Fig 1: Engine Wiring Harness Electrical Connector & MAP Sensor
    GM1897166Courtesy of GENERAL MOTORS CORP.
  1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief (Without CH 48027)Fuel Pressure Relief (With CH 48027) .
  2. Remove the air cleaner outlet duct. Refer to Air Cleaner Resonator Outlet Duct Replacement .
  3. Disconnect the engine wiring harness electrical connector (1) from the manifold absolute pressure (MAP) sensor.
    4. Fig 2: Positive Crankcase Ventilation (PCV) Foul Air Hose
    GM1897777Courtesy of GENERAL MOTORS CORP.
  4. Remove the positive crankcase ventilation (PCV) foul air hose (1).
    5. Fig 3: Engine Wiring Harness Clip & Ignition Coil Bracket Stud
    GM1897773Courtesy of GENERAL MOTORS CORP.
  5. Remove the engine wiring harness clip (1) from the ignition coil bracket stud (2).
    6. Fig 4: Engine Wiring Harness Clip & Ignition Coil Bracket Stud
    GM1897774Courtesy of GENERAL MOTORS CORP.
  6. Remove the engine wiring harness clip (1) from the ignition coil bracket stud (2).
    7. Fig 5: Air Cleaner Outlet Duct
    GM1897252Courtesy of GENERAL MOTORS CORP.
  7. Disconnect the engine wiring harness electrical connector (2) from the throttle body.
  8. Disconnect the engine wiring harness electrical connectors (1) from the fuel injectors.
  9. Disconnect the engine wiring harness electrical connector (3) from the ignition coil harness.
    10. Fig 6: Engine Wiring Harness Electrical Connector & Generator
    GM1897776Courtesy of GENERAL MOTORS CORP.
  10. Disconnect the engine wiring harness electrical connector (1) from the generator.
  11. Disconnect the engine wiring harness electrical connector (3) from the evaporative emission (EVAP) canister purge solenoid valve.
  12. Disconnect the engine wiring harness electrical connector (4) from the ignition coil harness.
    13. Fig 7: Engine Wiring Harness Electrical Connectors, Harness Bracket & Bracket Nut
    GM1897775Courtesy of GENERAL MOTORS CORP.
  13. Disconnect the engine wiring harness electrical connectors (3) from the fuel injectors.
  14. Remove the engine wiring harness bracket nut (1).
  15. Remove the engine wiring harness bracket (2) from the stud and reposition the harness as needed.
  16. Remove the EVAP canister purge solenoid valve. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement .
    17. Fig 8: Fuel Hose/Pipes Replacement - Chassis
    GM1897742Courtesy of GENERAL MOTORS CORP.
  17. Disconnect the chassis fuel feed line quick connect fitting (2) from the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .
    18. Fig 9: Fuel Rail Bolts
    GM1898207Courtesy of GENERAL MOTORS CORP.
  18. Remove the fuel rail bolts (1).
  19. Loosen but do not remove the fuel rail crossover pipe retainer clip screws.
    20. CAUTION:
    • 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.
    NOTE: Before removal, clean the fuel rail 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.
  20. Remove the fuel rail assembly (2).
  21. Remove and discard the fuel injector lower O-ring seals (3).
  22. If the fuel rail is not being replaced, proceed to the installation procedure.
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