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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 Pump Replacement >> Removal Procedure

Removal Procedure

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  1. Relieve the fuel system pressure. Fuel Pressure Relief 
    2. Fig 1: Fuel Pump Insulator
    GM2965636Courtesy of GENERAL MOTORS COMPANY
  2. Remove the fuel pump insulator (1). Fuel Pump Insulator Replacement 
    3. Fig 2: Low Pressure Fuel Feed Pipe, LH Rocker Cover Bolt, Redundant Clip And Fuel Pump
    GM2965635Courtesy of GENERAL MOTORS COMPANY
  3. Remove the fuel feed pipe fastener (4) and disconnect the fuel feed pipe (1) from the fuel pump (2). Plastic Collar Quick Connect Fitting Service 
    4. Fig 3: Crossover Pipe And Fuel Feed Pipe Fittings
    GM2965634Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Do NOT reuse the fuel feed intermediate pipe. If the fuel feed intermediate pipe fittings are loosened or the pipes are removed, the pipes MUST be replaced.

  4. Remove and DISCARD the fuel feed intermediate pipe (1). Fuel Feed Intermediate Pipe Replacement - Position 1 
  5. Disconnect and reposition the fuel pump and fuel injector wiring harness as necessary.
    6. Fig 4: NEW High Pressure Fuel Pump Gasket
    GM2965632Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Alternately loosen the fuel pump bolts one turn at a time until the pump is fully disengaged from fuel pump lifter follower. Trying to remove the pump bolts without even side-to-side loosening may result in pump plunger damage

  6. Remove Fuel Pump Bolt (5)
  7. Remove Fuel Pump Cover (4)
  8. Remove Retainer (3)
  9. Remove the fuel pump (2) and fuel pump gasket (1) from the engine.
  10. DISCARD the fuel pump gasket.
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