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Home >> Chevrolet >> 2021 >> Blazer RS, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Engine Controls And Fuel - 2.0L (LSY) - Repair Instructions) >> Repair Instructions >> Fuel Injector Replacement >> Installation Procedure

Installation Procedure

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  1. Fig 1: Identifying Fuel Injector Seals And Replacement Components
    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).

  2. 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.
  3. Compress the fuel injector nozzle housing seal (2) using EN-51955-3  Pre-Sizer (5).
  4. Using EN-51955-5  Sizer (6), resize the fuel injector nozzle housing seal.
  5. Install EN-51955-2  Short Protector (7) onto the fuel injector tip. Place a second NEW fuel injector nozzle housing seal (8) on EN-51955-2  Short Protector (7).
  6. 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-51955-2  Short Protector.
  7. Compress the fuel injector nozzle housing seal (8) using EN-51955-3  Pre-Sizer (5).
  8. Using EN-51955-5  Sizer (6), resize the fuel injector nozzle housing seal.
  9. 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)
  10. 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.
  11. GM5034352Courtesy of GENERAL MOTORS COMPANY

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

  12. Fuel Injection Fuel Rail Seal (1) - Install NEW [4x]
  13. Direct Fuel Injector Hold Down Clamp (5) - Install NEW [4x]
  14. Fuel Injector (3) - Install [4x]
  15. GM5034355Courtesy of GENERAL MOTORS COMPANY

    Check that the nose of the fuel injector (1) is positioned correctly in the fuel rail (2).

  16. GM5034357Courtesy of GENERAL MOTORS COMPANY

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

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

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

    19. NOTE:

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

  19. Fuel Injector Retainer (3) - Install
  20. Ensure the fuel injector retainer (3) is fully seated in the fuel rail.
  21. Repeat the procedure for the remaining 3 fuel injectors.
  22. Remove the EN-50791  Injector to Rail Installer (1) and EN-50791-100  Fuel Injector Installation Adapter (2).
  23. Fuel Injector Wiring Harness - Install - Fuel Injector Wiring Harness Replacement 
  24. Install the fuel injection fuel rail assembly. Fuel Injection Fuel Rail Assembly Replacement 
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