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Home › Buick › 2024 › Envision Preferred › Repair and Diagnosis › Engine Performance › System › Engine Controls And Fuel - 2.0L (LSY) - Repair Instructions › Repair Instructions › Fuel Injection Fuel Rail Assembly Replacement › Installation Procedure

Installation Procedure

  1. GM5034349Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Ensure the fuel rail threads are clean and free of any excess fuel, or the fuel injection fuel rail fuel pressure sensor will NOT seal properly.

    Lubricate the threads and sealing surface of the fuel injection fuel rail fuel pressure sensor (1) with one drop of clean engine oil. Adhesives, Fluids, Lubricants, and Sealers

    2. NOTE:

    Applying force to the plastic housing of the sensor may damage the sensor. To tighten or loosen, apply force only to the attached hexagon.

  2. Install the fuel injection fuel rail fuel pressure sensor (2) and hand tighten.
  3. Remove the fuel injection fuel rail pressure sensor (1) from the fuel injection fuel rail (2) and re-lubricate with one drop of clean engine oil. Adhesives, Fluids, Lubricants, and Sealers
    4. CAUTION:

    Refer to Component Fastener Tightening Caution .

    NOTE:

    Refer to the procedure link for torque specification.

  4. Fuel Injection Fuel Rail Fuel Pressure Sensor (1) @ Fuel Injection Fuel Rail (2) - Install and tighten - Fuel Rail Pressure Sensor Replacement 
  5. GM4840511Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    DO NOT use any type of lubricant when installing the NEW combustion seals on the fuel injector tip.

    Install EN-51955-1  Long Protector (1) onto the fuel injector tip, covering the first recessed area closest to the tip. Place a NEW fuel injector nozzle housing seal (2) on EN-51955-1  Long Protector (1).

  6. Using EN-51955-4  Pusher (3), install the fuel injector nozzle housing seal (2) into the recessed area (4) of the fuel injector, then remove the EN-51955-1  Long Protector.
  7. Compress the fuel injector nozzle housing seal (2) using EN-51955-3  Pre-Sizer (5).
  8. Using EN-51955-5  Sizer (6), resize the fuel injector nozzle housing seal.
  9. Install EN-51955-2  Short Protector (7) onto the fuel injector tip. Place a second NEW fuel injector nozzle housing seal (8) on EN-51105-2  Short Protector (7).
  10. Using EN-51955-4  Pusher (3), install the fuel injector nozzle housing seal (8) into the remaining recessed area (9) of the fuel injector, then remove EN-51105-2  Short Protector.
  11. Compress the fuel injector nozzle housing seal (8) using EN-51955-3  Pre-Sizer (5).
  12. Using EN-51955-5  Sizer (6), resize the fuel injector nozzle housing seal.
  13. GM2918356Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The fuel injector nozzle housing seals must fit properly in the relative groove. Overlapping of the fuel injector nozzle housing seals with the external surface of the injector must be avoided.

    Check both of the fuel injector nozzle housing seals on each fuel injector for correct seat:

    • The fuel injector nozzle housing seal must not be too large, buckled, or corrugated (1)
    • The fuel injector nozzle housing seal must be fixed tight and accurate (2)
  14. If the fuel injector nozzle housing seals are not installed correctly, remove the incorrect fuel injector nozzle housing seal and replace with a NEW fuel injector nozzle housing seal.
  15. Repeat the procedure for the remaining 3 fuel injectors.
  16. GM5034354Courtesy of GENERAL MOTORS COMPANY

    Fuel Injector Seal Spacer (2) - Install NEW [4x]

  17. Fuel Injection Fuel Rail Seal (1) - Install NEW [4x]
  18. Direct Fuel Injector Hold Down Clamp (4) - Install NEW [4x]
  19. Fuel Injector (3) - Install [4x]
  20. GM5034355Courtesy of GENERAL MOTORS COMPANY

    Check that the nose of the fuel injector (1) sits correct in the fuel rail (2).

  21. GM5034357Courtesy of GENERAL MOTORS COMPANY

    Ensure the EN-50791-100  Fuel Injector Installation Adapter (2) is mounted to the EN-50791  Injector to Rail Installer (1).

  22. Install EN-50791  Injector to Rail Installer (1) to the fuel injector (3).
  23. GM5034363Courtesy of GENERAL MOTORS COMPANY

    Using EN-50791  Injector to Rail Installer (1), compress the fuel injector (4) into the fuel rail.

    24. NOTE:

    Ensure the fuel injector is fully seated in the fuel rail.

  24. Fuel Injector Retainer (3) - Install NEW
  25. Ensure the fuel injector retainer (3) is fully seated in the fuel rail.
  26. Remove the EN-50791  Injector to Rail Installer (1) along with the EN-50791-100  Fuel Injector Installation Adapter (2).
  27. Repeat the procedure for the remaining 3 fuel injectors.
  28. GM5034350Courtesy of GENERAL MOTORS COMPANY

    Fuel Injector Wiring Harness (1) - Install

  29. Electrical Connector (2) - Connect [5x]
  30. Remove the fuel injection fuel rail from the vice.
  31. GM4995644Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Hand place the fuel injection fuel rail into the position on the cylinder head.

    Fuel Injection Fuel Rail (1) - Install

  32. GM4995756Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Install the 4 fuel injection fuel rail bolts with zero torque.

    Fuel Injection Fuel Rail Bolt (1, 2, 3) - Install [4x]

  33. Tighten the 2 outer fuel injection fuel rail bolt (1, 3) alternating in steps of 1/2 turn, until the fuel injection fuel rail (4) is fully seated.
    34. CAUTION:

    Refer to Fastener Caution .

  34. Fuel Injection Fuel Rail Bolt (1, 2, 3) - Tighten [4x] 36 N.m (27 lb ft)
  35. Electrical Connector (5, 6) - Connect [2x]
  36. GM4995197Courtesy 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 canceling 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 Injection Fuel Rail Insulator (1) - Install

  37. Wiring Harness (2) @ Fuel Injection Fuel Rail Insulator (1) - Install
  38. Fuel Feed Intermediate Pipe - Install - Fuel Feed Intermediate Pipe Replacement 
  39. GM5065029Courtesy of GENERAL MOTORS COMPANY

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

  40. Install the intake manifold and throttle body together as an assembly. Intake Manifold Replacement
  41. Connect the battery negative cable. Battery Negative Cable Disconnection and Connection
  42. 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.
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