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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 2 (LF3) >> Installation Procedure
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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 (106 lb in).
    2. Tighten the fuel rail bolts a final pass to 23 N.m (17 lb ft).
  5. Install Fuel Feed Pipe - at engine Fuel Feed Pipe Replacement (At Tank AWD) Fuel Feed Pipe Replacement (LF3 At Engine) 
  6. Connect the Bank 2 fuel rail electrical connector.
    7. Fig 3: Fuel Pressure Sensor And Electrical Connector
    GM2497626Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Refer to Component Fastener Tightening Caution .

  7. Install the fuel pressure sensor (3) and tighten to 33 N.m (24 lb ft)
  8. Connect the fuel pressure sensor connector (2).
  9. Install a NEW plastic tie strap (1).
  10. Install the NEW fuel feed intermediate pipe. Refer to Fuel Feed Intermediate Pipe Replacement (LF3) .
  11. 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.
    12. Fig 4: Fuel Injection Fuel Rail Noise Shield
    GM3319484Courtesy of GENERAL MOTORS COMPANY
  12. Install the fuel injection fuel rail noise shield (1) onto the engine (2).
  13. Install the intake manifold. Refer to Intake Manifold Replacement (LF3) .
  14. Install the fuel pipe shield. Refer to Fuel Pipe Shield Replacement (LF3) .
  15. If removed, Install the low side fuel pressure service port cap.
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