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Home >> Chevrolet >> 2021 >> Trailblazer ACTIV, FWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 1.35L (L3T) - Repair Instructions >> Repair Instructions >> Fuel Injector Replacement >> Installation Procedure
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Installation Procedure

  1. GM5136435Courtesy of GENERAL MOTORS COMPANY

    Fuel Injector Seal Retainer - Red (1) - Install NEW

  2. Fuel Injector Seal Retainer - White (2) - Install NEW
  3. Fuel Injection Fuel Rail Seal (3) - Install NEW
  4. GM5136410Courtesy of GENERAL MOTORS COMPANY
    NOTE:

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

    Holding the largest diameter/body (3) of the injector only, insert the injector assembly (3) into the fuel injection fuel rail. Ensure correct orientation of the electrical connector.

  5. Install a NEW fuel injection fuel rail clip (1) and fuel injector locating pins (2).
  6. Ensure the fuel injection fuel rail clip (1) is fully seated in the fuel injection fuel rail.
  7. Connect the appropriate fuel rail wiring harness connector at the direct fuel injector.
  8. Repeat the procedure for the remaining 2 direct fuel injectors.
  9. 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).

  10. 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.
  11. Compress the fuel injector nozzle housing seal (2) using EN-51955-3  Pre-Sizer (5).
  12. Using EN-51955-5  Sizer (6), resize the fuel injector nozzle housing seal.
  13. 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).
  14. 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.
  15. Compress the fuel injector nozzle housing seal (8) using EN-51955-3  Pre-Sizer (5).
  16. Using EN-51955-5  Sizer (6), resize the fuel injector nozzle housing seal.
  17. 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. Avoid handling the injector tip seals as much as possible to avoid damage.

    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)
  18. 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.
  19. Install the fuel injection fuel rail assembly. Fuel Injection Fuel Rail Assembly Replacement 
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