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Home >> GMC >> 2021 >> Acadia AT4 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 3.6L (LGX) - Repair Instructions >> Repair Instructions >> Fuel Injector Replacement >> Installation Procedure

Installation Procedure

  1. Install NEW fuel injector bushing (1) onto injector body. Bushing should seat with a distinct "snap" sound and feel. Ensure bushing is fully seated.
    GM2915264Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The fuel injector bushing (1) is to be installed BEFORE O-ring or backup rings are installed.

  2. Install a NEW white plastic spacer (3) on the fuel injector first.
    GM2915265Courtesy of GENERAL MOTORS COMPANY
  3. Install a NEW brown plastic spacer (2) second.
  4. Lubricate the NEW O-ring (1) with one drop of clean engine oil.
  5. Install NEW fuel injector retainer (3) onto the fuel injector.
    GM2915262Courtesy of GENERAL MOTORS COMPANY
  6. Holding the largest diameter/body of the injector only, indicated by arrow in graphic, insert the injector assembly (1) into the fuel rail. Ensure correct orientation of the electrical connector (2).
  7. Rotate the fuel injector approximately 45 degrees until the tab on the retainer (4) locks into the notch on the fuel rail.
  8. Repeat for remaining injectors until all are installed and retained in fuel rail.
  9. Fuel Injector Wiring Harness (1) - Install
    GM2202041Courtesy of GENERAL MOTORS COMPANY
  10. Install EN 49245-1  long protector (3) onto the fuel injector tip, covering the first recessed area closest to the tip. Place a NEW seal (2) on EN-49245-1  long protector.
    GM5044263Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • Do not use any type of lubricant when installing the NEW seals (2) on the fuel injector tip.
    • If an injector is reused, the injector tips seals must be replaced with NEW.
  11. Using EN-49245-3  pusher (1), install the seal into the second recessed area (4) of the fuel injector.
    12. NOTE:

    The EN-49245-4  sizer is two sided, and either direction will size the seal correctly.

  12. Compress the seal with your fingers, then resize the seal using the EN-49245-4  sizer (5).
  13. Install EN-49245-2  short protector (3) onto the fuel injector tip. Place a NEW seal (2) on EN-49245-2  short protector.
    GM5044264Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Do not use any type of lubricant when installing the NEW seals (2) on the fuel injector tip.

  14. Using EN-49245-3  pusher (1), install the seal into the first recessed area (4) of the fuel injector.
    15. NOTE:

    The EN-49245-4  sizer is two sided, and either direction will size the seal correctly.

  15. Compress the seal with your fingers, then resize the seal using the EN-49245-4  sizer (5).
    16. NOTE:

    The fuel injectors have an alignment feature and must be reinstalled as noted during removal.

  16. Install the fuel injection fuel rail assembly.
  17. Pressure up the fuel system and check for leaks.
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