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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 100 (Engine Control System & Fuel - 4.8L, 5.3L, 6.0L And 6.2L - Introduction (2 Of 2)) >> Repair Instructions >> Fuel Rail Crossover Pipe Replacement >> Removal Procedure

Removal Procedure

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IMPORTANT: An 8-digit identification number is located on the fuel rail. Refer to this identification number when servicing or when part replacement is required.
    Fig 1: View Of Engine Harness Retainer Nut & Electrical Connectors
    GM1696891Courtesy of GENERAL MOTORS CORP.
  1. Remove the air cleaner outlet duct. Refer to Air Cleaner Resonator Outlet Duct Replacement .
  2. Relieve the fuel system pressure. Refer to Fuel Pressure Relief .
  3. Remove the engine wiring harness bracket nut (1).
  4. Disconnect the engine wiring harness electrical connector (2) from the evaporative emission (EVAP) purge solenoid.
  5. Disconnect the engine wiring harness electrical connector (3) from the generator.
  6. Disconnect the engine wiring harness electrical connector (4) from the manifold absolute pressure (MAP) sensor.
    7. Fig 2: View Of CPA Retainer, Electrical Connectors & Engine Harness Clips
    GM1696892Courtesy of GENERAL MOTORS CORP.
  7. Remove the connector position assurance (CPA) retainer (2).
  8. Disconnect the engine wiring harness electrical connector (1) from the ignition coil main electrical connector.
  9. Disconnect the engine wiring harness electrical connectors (3) from the fuel injectors, perform the following:
    1. Mark the connectors to their corresponding injectors to ensure correct reassembly.
    2. Pull the CPA retainer on the connector up 1 click.
    3. Push the tab on the connector in.
    4. Disconnect the fuel injector electrical connector.
    10. Fig 3: View Of CPA Retainer, Engine Harness Electrical Connectors & Harness Clips
    GM1696893Courtesy of GENERAL MOTORS CORP.
  10. Remove the CPA retainer (2).
  11. Disconnect the engine wiring harness electrical connector (1) from the ignition coil main electrical connector.
  12. Disconnect the engine wiring harness electrical connector (3) from the electronic throttle control.
  13. Disconnect the engine wiring harness electrical connectors (7) from the fuel injectors, perform the following:
    1. Mark the connectors to their corresponding injectors to ensure correct reassembly.
    2. Pull the CPA retainer on the connector up 1 click.
    3. Push the tab on the connector in.
    4. Disconnect the fuel injector electrical connector.
  14. Remove the engine wiring harness clip (4) from the generator battery jumper cable.
  15. Remove the engine wiring harness clip (6) from the ignition coil bracket stud.
    16. Fig 4: View Of Battery Cable Terminals & Stud
    GM1699543Courtesy of GENERAL MOTORS CORP.
  16. Remove the negative battery cable stud (1) from the right cylinder head.
  17. Remove the negative battery cable terminal (2) and engine wiring harness ground terminal (3) from the cylinder head.
    18. Fig 5: View Of Engine Wiring Harness, Clip, Bolt & Connector
    GM1696914Courtesy of GENERAL MOTORS CORP.
  18. Remove the engine wiring harness clip bolt (3) from the generator bracket.
  19. Gather the branches of the engine wiring harness and reposition the aside.
    20. Fig 6: View Of Fuel Rail Cross Over Pipe & Components
    GM1706107Courtesy of GENERAL MOTORS CORP.
  20. Remove the fuel rail crossover pipe retainer screws (2).
  21. Remove the fuel rail crossover pipe retainers (3).
  22. Remove the fuel rail crossover pipe (1) from the fuel rails.
  23. Remove and discard the fuel rail crossover pipe O-ring seals (4).
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