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Home › Chevrolet › 2010 › Cutaway 6.6 L › Repair and Diagnosis › Engine Performance › Engine Control Systems › Engine Controls And Fuel - 6.6L (LGH) - Repair Instructions › Repair Instructions › Emission Reduction Fluid Supply Pump Module Replacement › Disassembly Procedure

Disassembly Procedure

  1. Remove the DEF supply pump module insulators.
  2. Note the routing of the DEF wiring jumper harness,
    3. Fig 1: Fuel Pump, Fuel Pressure Sensor, And Fuel Reverting Valve
    GM2767926Courtesy of GENERAL MOTORS COMPANY
  3. Disconnect the DEF wiring jumper harness connectors from the pump (1), pressure sensor (2), and reverting valve (3).
    4. Fig 2: DEF Supply Pump Module
    GM2767924Courtesy of GENERAL MOTORS COMPANY
  4. Remove the 3 DEF supply pump module retaining bolts (1).
  5. Carefully lift the DEF supply pump module (2) to remove from the reservoir cover.
    6. Fig 3: Reservoir Cover Supply Pump Ports
    GM2767938Courtesy of GENERAL MOTORS COMPANY
  6. Carefully remove & discard the supply pump to reservoir cover o-ring seals (1). The seals will typically remain in the reservoir cover, but may be on the underside of the supply pump.
  7. Wipe away any dried DEF crystallization residue from the reservoir cover supply pump ports (2).
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