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Home >> Cadillac >> 2017 >> XTS Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Controls And Fuel - 3.6L (LFX LF3) - Repair Instructions >> Repair Instructions >> Fuel Injection Fuel Rail Assembly Replacement - Bank 1 (LF3) >> Installation Procedure

Installation Procedure

    Fig 1: Sliding Fuel Rail Toward Front Of Engine
    GM3319791Courtesy of GENERAL MOTORS COMPANY
  1. Slide the fuel rail (1) toward the front of the engine approximately 1 inch (25.4mm), in order to align the center injector bore.
    2. Fig 2: Identifying Fuel Rail Bolt Tightening Sequence
    GM2193072Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Refer to Fastener Caution .

  2. Hand tighten the two outer fuel rail fasteners to seat the injectors.
  3. Start and hand tighten the remaining fuel rail fasteners.
  4. Tighten the fuel rail fasteners in the sequence shown above:
    1. Tighten the fuel rail bolts first pass to 12 N.m (9 lb ft).
    2. Tighten the fuel rail bolts a final pass to 23 N.m (17 lb ft).
  5. Install the NEW fuel feed intermediate pipe. Refer to Fuel Feed Intermediate Pipe Replacement (LF3) .
  6. Inspect for fuel leaks using the following procedure:
    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.
    7. Fig 3: Fuel Injection Fuel Rail Noise Shield
    GM3319484Courtesy of GENERAL MOTORS COMPANY
  7. Install the fuel injection fuel rail noise shield (1) onto the engine (2).
  8. Install the intake manifold. Refer to Intake Manifold Replacement (LF3) .
  9. Install the fuel pipe shield. Refer to Fuel Pipe Shield Replacement (LF3) .
  10. If removed, install the low side fuel pressure service port cap.
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