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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 8 (Engine Controls And Fuel - 5.3L (L83) Or 6.2L (L86) - Repair Instructions) >> Repair Instructions >> Fuel Injection Fuel Rail Assembly Replacement - Bank 2 >> Removal Procedure

Removal Procedure

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  1. Relieve the fuel pressure. Fuel Pressure Relief .
    2. 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.

  2. Remove the fuel pump insulator. Fuel Pump Insulator Replacement .
  3. Remove the fuel injector intermediate pipe position 1. Fuel Feed Intermediate Pipe Replacement - Position 1 .
  4. Clean the cylinder head pocket around the injectors of any dirt or buildup.
  5. Disconnect the electrical wiring harness connectors from the fuel rail.
    6. Fig 1: Fuel Rail Fasteners
    GM4363856Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The fuel rail fasteners are retained in the fuel rail by keepers and may be difficult to remove.

  6. Remove the fuel rail fasteners (1) securing the injector rail (2).
    7. Fig 2: Two Sets Of Remover
    GM3286479Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • In some cases, the fuel injectors may be difficult to remove because of heavy carbon build-up or other factors. Excessive force with the removal tool can damage the fuel rail, injectors or both. If injectors are difficult to remove, apply solvent to the base of the injector bores, and allow adequate soaking time, to loosen the fuel injectors.
    • Pull the fuel rail and injectors as an assembly.
    • To prevent material from entering the combustions chambers make sure the area around each injector is clean and free of debris before the injectors are removed from the injector bores.
  7. Install two sets of EN-49248 remover (3).
    1. Install one remover in each of the fuel rail fastener bores.
    2. Remove by turning each section of the EN-49248 remover an even amount to pull the fuel rail and injectors out evenly.
      3. CAUTION:
      • Remove the fuel rail assembly carefully in order to prevent damage to the injector electrical connector terminals and the injector spray tips. Support the fuel rail after the fuel rail is removed in order to avoid damaging the fuel rail components.
      • Cap the fittings and plug the holes when servicing the fuel system in order to prevent dirt and other contaminants from entering open pipes and passages.
    3. Simultaneously lift both ends of the fuel rail (2) and remove the fuel rail assembly from the cylinder head.
  8. Remove and DISCARD the fuel injector seals.
    9. Fig 3: Fuel Injector Dust Seal
    GM4560526Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Some vehicles were not originally equipped with fuel injector dust seals. A NEW seal must be installed when the injectors are removed.

  9. Remove and DISCARD the fuel injector dust seal (1).
    10. NOTE:

    Whenever the fuel injectors are removed from the cylinder head or fuel rail, they will need to be rebuilt. Fuel Rail and Injectors Cleaning and Inspection .

  10. If replacing the fuel injection fuel rail, remove the fuel injectors. Fuel Injector Replacement .
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