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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 166 (Engine Controls And Fuel - 3.6L (LGX LF4) - Repair Instructions) >> Repair Instructions >> Fuel Pump Replacement (LF4) >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Fuel Pump Installation Alignment Gauge
    GM2226321Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The camshaft must be in the base circle position before the high pressure fuel pump is installed.

  1. Use the EN 48896  alignment gauge (2) to ensure that the camshaft lobe is in the base circle position. At base circle position, the tool will be flush with the head (1).
    2. Fig 2: Fuel Pump Components
    GM3599729Courtesy of GENERAL MOTORS COMPANY
  2. Lubricate the high pressure fuel pump cylinder head bore with clean engine oil. Refer to Adhesives, Fluids, Lubricants, and Sealers
    3. NOTE:

    Ensure that the high pressure fuel pump roller lifter is oriented properly, the camshaft is at base circle and the number 1 piston is at top dead center (TDC) on the exhaust stroke.

  3. Lubricate the high pressure fuel pump roller lifter with clean engine oil and install into the cylinder head bore.
    4. NOTE:

    The locator tab on the fuel pump gasket should be positioned away from the engine block.

  4. Install a NEW high pressure fuel pressure fuel pump gasket (4).
    5. NOTE:

    Lubricate the NEW O-ring seals with clean engine oil.

  5. Install a NEW high pressure fuel pump O-ring (5).
    6. NOTE:

    Ensure the plastic bolt retainers are installed in the high pressure fuel pump mounting holes before installing.

  6. Install the valve lifter follower (3).
  7. Install the high pressure fuel pump (2).
    8. CAUTION:

    Refer to Fastener Caution .

    CAUTION:

    Alternately hand-tighten the fuel pump bolts one turn at a time until the pump is fully seated. Trying to draw down the pump without even side-to-side tightening may result in pump plunger damage.

    CAUTION:

    This vehicle is equipped with torque-to-yield or single use fasteners. Install a NEW torque-to-yield or single use fastener when installing this component. Failure to replace the torque-to-yield or single use fastener could cause damage to the vehicle or component.

  8. Start and hand-tighten the NEW high pressure fuel pump bolts (1) evenly.
    1. Tighten the fuel pump bolts (1) a first pass in sequence to 15 N.m (11 lb ft).
    2. Tighten the fuel pump bolts (1) a final pass of an additional 60 degrees.
    9. Fig 3: Fuel Pump And Electrical Connector
    GM4214941Courtesy of GENERAL MOTORS COMPANY
  9. Connect Electrical Connector (1) @ Fuel Pump (2)
  10. Install the NEW fuel feed intermediate pipe. Refer to Fuel Feed Intermediate Pipe Replacement (LF4) 
  11. Install the NEW fuel feed pipe. Refer to Fuel Feed Pipe Replacement (Fuel Tank To Engine LF4) Fuel Feed Pipe Replacement (LF4 at Engine) 
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