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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 Injection Fuel Rail Assembly Replacement >> Removal Procedure
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Removal Procedure

  1. Relieve the fuel system pressure. Fuel Pressure Relief 
  2. Disconnect the battery negative cable. Battery Negative Cable Disconnection and Connection
  3. Charge Air Cooler Outlet Air Hose - Remove Charge Air Cooler Outlet Air Hose Replacement 
  4. Remove the intake manifold and throttle body together as an assembly. Intake Manifold Replacement
  5. GM5065029Courtesy of GENERAL MOTORS COMPANY

    Engine Coolant Flow Control Valve (1) - Remove Engine Coolant Flow Control Valve Replacement

  6. Fuel Feed Intermediate Pipe - Remove Fuel Feed Intermediate Pipe Replacement 
  7. GM4995197Courtesy of GENERAL MOTORS COMPANY

    Wiring Harness (2) @ Fuel Injection Fuel Rail Insulator (1) - Remove

  8. 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.

  9. Fuel Injection Fuel Rail Insulator (1) - Remove
  10. GM4995278Courtesy of GENERAL MOTORS COMPANY

    Electrical Connector (2, 3) - Disconnect [2x]

  11. Fuel Injection Fuel Rail Bolt (1) - Remove [4x]
  12. GM4995383Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Use care to avoid contact with the fuel rail harness during special tool installation and fuel rail removal.

    Install the 2 studs (2) from EN-49248  Injector Rail Assembly Remover to the fuel injection fuel rail bolt holes and hand tighten.

  13. Install the EN-49248  Injector Rail Assembly Remover (4) onto each stud (2) and engage the hooks to the fuel injection fuel rail.
  14. Install and tighten the 2 nuts (1, 3).
  15. GM4995505Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • Turn BOTH handles simultaneously, in small, even increments.
    • Do NOT twist the fuel injector fuel rail while removing.

    Rotate the handles (1) from the EN-49248  Injector Rail Assembly Remover and remove the fuel injection fuel rail (2).

  16. EN-49248  Injector Rail Assembly Remover - Remove
  17. Fuel Injection Fuel Rail (2) - Remove
  18. Fuel Injector Nozzle Housing Seal - Remove and DISCARD [8x]
  19. Clean the fuel injector bores and clean the fuel injectors, if the fuel injectors will be re-installed.