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Home >> GMC >> 2001 >> Yukon Base, 5.3 T, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 4.8L, 5.3L, And 6.0L - Repair Instructions >> Repair Instructions >> Fuel Rail Outlet Pipe Replacement >> Installation Procedure

Installation Procedure

    Fig 1: Exploded View Of Fuel Rails & Injector Components
    GM350543Courtesy of GENERAL MOTORS COMPANY
  1. Lubricate the new fuel return pipe O-ring (6) with clean engine oil.
  2. Install the fuel return pipe O-ring (6) on the fuel return pipe (1).
  3. Install the fuel return pipe (1) to the left fuel rail (14).

    Refer to FASTENER NOTICE in Cautions and Notices.

  4. Install the fuel return pipe retainer (2) and the fuel return pipe attaching screw (3).

    Tighten 

    Tighten the fuel return pipe attaching screw (3) to 5 N.m (44 lb in).

    5. Fig 2: View Of Rear Of Engine Fuel Pipe Connections
    GM300360Courtesy of GENERAL MOTORS COMPANY
  5. Connect the fuel return pipe (2) and the fuel feed pipe (1) to the fuel rail.
  6. Tighten the fuel filler cap.
  7. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (Auxiliary Battery) , Battery Negative Cable Disconnection and Connection (Single Battery) in Engine Electrical.
  8. Use the following procedure in order to inspect for leaks:
    1. Turn ON the ignition, with the engine OFF,for 2 seconds.
    2. Turn OFF the ignition for 10 seconds.
    3. Turn ON the ignition, with the engine OFF.
    4. Inspect for fuel leaks.
  9. Install the engine sight shield. Refer to Upper Intake Manifold Sight Shield Replacement (6.0 L w/RPOs Y91 and Z88) , Upper Intake Manifold Sight Shield Replacement (4.8 L, 5.3 L, and 6.0 L) in Engine Mechanical.
  10. Install the fuel pressure connection cap.
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