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HOMESERVICE MANUALSCHEVROLET2014EXPRESS 2500 BASE, VAN CARGO, 6.6L ENG VIN LREPAIR AND DIAGNOSISENGINE PERFORMANCETUNE-UPENGINE CONTROLS AND FUEL - 6.6L (LGH) - REPAIR INSTRUCTIONSREPAIR INSTRUCTIONSEMISSION REDUCTION FLUID SUPPLY PUMP MODULE REPLACEMENTDISASSEMBLY PROCEDURE
2014 Chevrolet Express 2500 Base, Van Cargo, 6.6L Eng VIN L

Disassembly Procedure

2014 Chevrolet Express 2500 Base, Van Cargo, 6.6L Eng VIN LSECTION 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

    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).
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.