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Home >> Chevrolet >> 2004 >> Avalanche 2500 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Control System - 4.8L, 5.3L & 6.0L (Introduction)) >> Repair Instructions >> Fuel Rail Assembly Replacement (4.8L, 5.3L, and 6.0L Engines) >> Installation Procedure

Installation Procedure

WARNING: This page is about a different variant/trim than selected.
    Fig 1: View Of Fuel Injector, Clip & O-Rings
    GM351185Courtesy of GENERAL MOTORS CORP.
  1. Lubricate NEW fuel injector lower O-ring seals (4) with clean engine oil.
  2. Install the NEW O-ring seals (4) onto each injector, if necessary.
    3. Fig 2: View Of Fuel Rail W/Injectors
    GM1201536Courtesy of GENERAL MOTORS CORP.
  3. Install the fuel rail.
  4. Apply a 5 mm (0.2 in) band of threadlock GM P/N 12345382 (Canadian PN 10953489), or equivalent to the threads of the fuel rail bolts.
    NOTE: Refer to the Fastener Notice in Cautions and Notices.
  5. Install the fuel rail bolts.

    Tighten:  Tighten the bolts to 10 N.m (89 lb in).

    6. Fig 3: Identifying Fuel Feed & EVAP Pipes
    GM1238585Courtesy of GENERAL MOTORS CORP.
  6. Connect the fuel feed pipe (1) to the fuel rail. Refer to Quick Connect Fitting(s) Service (Metal Collar) .
    7. Fig 4: View Of PCV Hose
    GM1201537Courtesy of GENERAL MOTORS CORP.
  7. Install the PCV hose.
    8. Fig 5: CPA Retainer & Tab
    GM820977Courtesy of GENERAL MOTORS CORP.
  8. Perform the following steps in order to connect the fuel injector electrical connectors.
    1. Install the connectors to their corresponding injectors to ensure correct reassembly.
    2. Connect the fuel injector electrical connector.
    3. Push the CPA retainer (2) on the connector in 1 click.
    4. Repeat the steps for each injector electrical connector.
    9. Fig 6: View Of Main Ignition Coil Wire Harness Connector & Clips
    GM757686Courtesy of GENERAL MOTORS CORP.
  9. Position the engine wire harness.
  10. Connect the following electrical connectors to both sides of the engine:
    • Main coil (2)
    • Fuel injectors
  11. Install the harness clips to the fuel rail (1).
  12. Install the CPA retainers.
    13. Fig 7: View Of MAP Sensor & Knock Sensor Electrical Connectors
    GM679510Courtesy of GENERAL MOTORS CORP.
  13. Connect the following electrical connectors:
    • MAP sensor (1)
    • Knock sensor (2)
  14. Install the knock sensor harness connector to the intake manifold.
    15. Fig 8: View Of EVAP Canister Purge Solenoid & Generator Electrical Connectors & Bracket Nut
    GM1235683Courtesy of GENERAL MOTORS CORP.
  15. Connect the EVAP purge solenoid electrical connector (1).
  16. Connect the generator electrical connector (3).
  17. Install the wire harness bracket nut (2).

    Tighten:  Tighten the nut to 5 N.m (44 lb in).

  18. Tighten the fuel fill cap.
  19. Connect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
  20. Use the following procedure in order to inspect for leaks:
    1. Turn the ignition ON, with the engine OFF, for 2 seconds.
    2. Turn the ignition OFF for 10 seconds.
    3. Turn the ignition ON, with the engine OFF.
    4. Inspect for fuel leaks.
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