LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Isuzu >> 2004 >> Ascender LS, 5.3 P, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls (Introduction) - 5.3L >> Repair Instructions >> Fuel Rail Crossover Pipe Replacement >> Installation Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Installation Procedure

    Fig 1: Exploded View Of Fuel Rails & Injector Components
    GM350543Courtesy of GENERAL MOTORS CORP.
  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).
    NOTE: Refer to Fastener Notice in Cautions and Notices.
    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 on the rail.
  4. Install the crossover fuel pipe retainer clip (21). Loosely install the retainer 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).
    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 on the rail.
  9. Install the crossover fuel pipe retainer clip (5). Loosely install the retainer clip attaching screw (4).

    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. Fig 2: View Of EVAP/Fuel Hose/Pipes
    GM856643Courtesy of GENERAL MOTORS CORP.
  11. Connect the fuel feed and return pipes (1) to the fuel rail. Refer to Quick Connect Fitting(s) Service (Metal Collar) .
  12. Install the fuel fill cap.
  13. Connect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
  14. Use the following procedure in order to inspect for leaks:
    1. Turn the ignition ON, with the engine OFF, for 2 seconds.
    2. Turn OFF the ignition OFF for 10 seconds.
    3. Turn ON the ignition ON, with the engine OFF.
    4. Inspect for fuel leaks.
scientia non olet · About LEMON Manuals