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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 483 (ENGINE CONTROLS - 6.0L - ALTERNATIVE FUELS (INTRODUCTION))REPAIR INSTRUCTIONSFUEL RAIL ASSEMBLY REPLACEMENT (KL6)DISASSEMBLY PROCEDURE
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Disassembly Procedure

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Disassembly Procedure
WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Identifying Fuel Rail Assembly Components
    GM798436Courtesy of GENERAL MOTORS CORP.
  1. Remove the crossover tube (3) rail retainer screws.
  2. Remove the crossover tube.
  3. Remove the CNG injectors (7) from the gasoline fuel injector adapters (6).
  4. Separate the CNG fuel rail from the gasoline fuel rail.
  5. Remove the fuel injector retaining clip.
  6. Remove the injector from the fuel rail with a pulling and twisting motion.
  7. Remove the fuel injector adaptor (6) from the gasoline fuel injector.
  8. Repeat steps 5, 6 and 7 for the remaining fuel injectors.
    9. Fig 2: Identifying CNG Fuel Rail Pressure Sensor
    GM758213Courtesy of GENERAL MOTORS CORP.
  9. Remove the CNG fuel rail pressure sensor or the temperature sensor hold down bolt (6).
  10. Remove the sensor (2) from the fuel rail (4).
  11. Remove and discard any remaining O-rings from the fuel rail.
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.