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Home >> Buick >> 2021 >> Envision Preferred, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 2.0L (LSY) - Repair Instructions >> Repair Instructions >> Fuel Pump Replacement >> Installation Procedure
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Installation Procedure

  1. GM4967492Courtesy of GENERAL MOTORS COMPANY

    The EN-52443  High Pressure Fuel Pump Alignment Tool has two ends marked with number 1 (1) and number 2 (2).

  2. GM4967236Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • The camshaft MUST be at the base circle position before the fuel pump is installed.
    • At the base circle position, the EN-52443  High Pressure Fuel Pump Alignment Tool will sit flush with the cylinder head.

    Install the EN-52443  High Pressure Fuel Pump Alignment Tool (1) with the number 2 (1) facing outward and turn the crankshaft until the camshaft lobe is at the base circle position.

  3. Remove the EN-52443  High Pressure Fuel Pump Alignment Tool (1).
  4. GM4967228Courtesy of GENERAL MOTORS COMPANY

    Lubricate the valve lifter follower (2) with clean engine oil.

  5. Valve Lifter Follower (2) - Install
  6. Lubricate the fuel pump seal (3) with clean engine oil.
  7. Fuel Pump Seal (3) - Install NEW
  8. Fuel Pump (1) - Install
  9. 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.

  10. Fuel Pump Bolt (4) - Install and tighten [2x] 36 N.m (27 lb ft)
  11. Connect the electrical connector.
  12. GM4967224Courtesy of GENERAL MOTORS COMPANY
    WARNING:

    The noise cancelling foam component MUST be replaced if it has been exposed to engine fluids. Failure to replace the noise cancelling foam component that has been exposed to engine fluids may result in an engine fire resulting in catastrophic engine damage, and possible injury or death.

    Fuel Pump Insulator (1) - Install

  13. GM5600704Courtesy of GENERAL MOTORS COMPANY

    Connect the fuel feed pipe (2) to the fuel pump. Metal Collar Quick Connect Fitting Service 

  14. Connect the fuel feed pipe to the clip (1).
  15. Install the fuel feed intermediate pipe. Fuel Feed Intermediate Pipe Replacement 
  16. Connect the fuel feed pipe from the fuel pump. Fuel Feed Pipe Replacement (AWD) , or Fuel Feed Pipe Replacement (FWD) 
  17. Connect the battery negative cable. Battery Negative Cable Disconnection and Connection
  18. Inspect for 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.