GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 HUMMER 🢒 2003 🢒 H2 🢒 Engine 🢒 Engine Controls - 4.8L, 5.3L, and 6.0L 🢒 Fuel Injection Fuel Rail Crossover Tube Replacement

Removal Procedure

    Object Number: 300360 Size: SH
  1. Remove the engine sight shield. Refer to Upper Intake Manifold Sight Shield Replacement in Engine Mechanical - 4.8L, 5.3L and 6.0L.
  2. Relieve the fuel system pressure. Refer to Fuel Pressure Relief .
  3. Disconnect the fuel feed (1) and fuel return (2) pipes from the fuel rail.
  4. Disconnect the vacuum hose from the fuel pressure regulator.
  5. Remove the engine harness retaining nut and position the harness to the side.

    6. Object Number: 350543 Size: SH
  6. Remove the fuel return pipe attaching screw (3) and the fuel return pipe retainer (2).
  7. Remove the fuel return pipe (1).
  8. Remove and discard the fuel return pipe O-ring (6).
  9. Remove the fuel pressure connection core assembly (24) from the crossover pipe rail (25).
  10. Remove the retaining clip attaching screw (22) and the crossover fuel pipe retainer clip (21).
  11. Remove the retaining clip attaching screw (4) and the crossover fuel pipe retainer clip (5).
  12. Remove the crossover pipe rail assembly (25) from the left hand rail assembly (14) and the right hand rail assembly (15).
  13. Remove and discard the crossover fuel pipe O-rings (7, 20).

Installation Procedure

    Object Number: 350543 Size: SH
  1. Lubricate the NEW crossover fuel pipe O-rings (7, 20) with clean engine oil.
  2. Install the NEW crossover fuel pipe O-rings (7, 20) onto the crossover pipe rail assembly (25).
  3. Install the crossover pipe rail assembly (25) to the left hand rail assembly (14) and the right hand rail assembly (15).

    4. Important: When installing the retaining clip attaching screws for the crossover pipe, always start them by hand. This will prevent consequent stripping of the threads in the rail.

  4. Install the crossover fuel pipe retainer clip (21). Loosely install the retaining clip attaching screw (22).
  5. Lubricate the NEW fuel return pipe O-ring (6) with clean engine oil.
  6. Install the NEW fuel return pipe O-ring (6) on the fuel return pipe (1).
  7. Install the fuel return pipe (1).
  8. Install the fuel return pipe retainer (2). Loosely install the fuel return pipe attaching screw (3).

    9. Notice: Refer to Fastener Notice in the Preface section.

    Important: When installing the retaining clip attaching screws for the crossover pipe, always start them by hand. This will prevent consequent stripping of the threads in the rail.

  9. Install the crossover fuel pipe retainer clip (5). Loosely install the retaining clip attaching screw (4).

    10. Tighten

    1. Tighten the crossover fuel pipe retainer clip attaching screws (4, 22) to 3.8 N·m (34 lb in).
    2. Tighten the fuel return pipe attaching screw (3) to 5 N·m (44 lb in).
  10. Install the fuel pressure connection core assembly (24) to the crossover pipe rail assembly (25).
  11. Position the engine harness and install the harness retaining nut.

    12. Tighten
    Tighten the nut to 6 N·m (49 lb in).

  12. Connect the fuel regulator vacuum hose.

    13. Object Number: 300360 Size: SH
  13. Connect the fuel return (2) and fuel feed (1) pipes to the fuel rail.
  14. Tighten the fuel fill cap.
  15. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  16. Use the following procedure in order to inspect for leaks:
    17. 16.1. Turn ON the ignition, with the engine OFF, for 2 seconds.
    16.2. Turn OFF the ignition for 10 seconds.
    16.3. Turn ON the ignition, with the engine OFF.
    16.4. Inspect for fuel leaks.
  17. Install the fuel pressure connection cap.
  18. Install the engine sight shield. Refer to Upper Intake Manifold Sight Shield Replacement in Engine Mechanical - 4.8L, 5.3L and 6.0L.