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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1137 (Engine Controls And Fuel - 3.6L - Introduction (2 Of 2)) >> Repair Instructions >> Fuel Pump Replacement (LLT) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: High pressure fuel feed pipes are one time use only. ALWAYS install a NEW high pressure fuel feed pipe if the pipe is removed OR the fittings are loosened.
  1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief (With CH 48027 - LY7)  or Fuel Pressure Relief (Without CH 48027 - LY7)  or Fuel Pressure Relief (With High Pressure Pump - LLT) .
  2. Remove the fuel pipe shield. Refer to Fuel Pipe Shield Replacement (LLT) .
  3. Remove and DISCARD the fuel feed pipe. Refer to Fuel Feed Pipe Replacement (LLT) .
  4. Remove and DISCARD the fuel feed intermediate pipe. Refer to Fuel Feed Intermediate Pipe Replacement (LLT) .
  5. Disconnect the electrical connector from the fuel pump
  6. Fig 1: High Pressure Fuel Pump Components
    GM2221135Courtesy of GENERAL MOTORS CORP.
    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

    Remove and DISCARD the fuel pump bolts (1).

    NOTE: Ensure that during removal of the fuel pump that the valve lifter follower does NOT fall apart.
  7. Remove the fuel pump (2).
  8. Remove and DISCARD the fuel pump housing seal (3).
  9. Remove and DISCARD the fuel pump bracket gasket (4).
    NOTE:
    • The valve lifter follower MAY remain in the cylinder head bore after removing the fuel pump.
    • If the valve lifter follower does NOT pull out of the cylinder head bore with the fuel pump, then remove it afterwards.
  10. Remove the vlave lifter follower (5).
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