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Home >> GMC >> 2014 >> Sierra 2500 HD SLT, 6.6L Eng VIN 8, RWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Controls/Fuel - 6.6L (LML) - Repair Instructions >> Repair Instructions >> Emission Reduction Fluid Supply Pump Module Replacement >> Disassembly Procedure

Disassembly Procedure

    Fig 1: DEF Supply Pump Module Shield
    GM2767738Courtesy of GENERAL MOTORS COMPANY
  1. Remove the DEF supply pump module shield (1).
    2. Fig 2: DEF Supply Pump Module Insulators
    GM2767741Courtesy of GENERAL MOTORS COMPANY
  2. Remove the DEF supply pump module insulators (1).
  3. Note the routing of the DEF wiring jumper harness.
    4. Fig 3: Pump, Pressure Sensor And Reverting Valve
    GM2767744Courtesy of GENERAL MOTORS COMPANY
  4. Disconnect the DEF wiring jumper harness connectors from the pump (1), pressure sensor (2), and reverting valve (3).
    5. Fig 4: DEF Supply Pump Module
    GM2767749Courtesy of GENERAL MOTORS COMPANY
  5. Remove the 3 DEF supply pump module retaining bolts (1).
  6. Carefully lift the DEF supply pump module (2) to remove from the reservoir cover.
    7. Fig 5: Reservoir Cover O-Ring Seals
    GM2767757Courtesy of GENERAL MOTORS COMPANY
  7. 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.
  8. Wipe away any dried DEF crystallization residue from the reservoir cover supply pump ports (2).
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