SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 2072 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 6.6L (LMM) - REPAIR INSTRUCTIONS)REPAIR INSTRUCTIONSFUEL SYSTEM PRIMING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Fuel System Priming

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Fuel System Priming
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: In order for the diesel fuel system to work properly, the fuel lines must be full of fuel and contain no air. If air gets into the fuel lines, it will be necessary to prime the fuel system to eliminate the air before operating the vehicle. Air could have entered the system in one of the following ways:
  • The vehicle ran out of fuel.
  • The filter was removed for service or replacement.
  • The fuel lines were removed or disconnected for servicing.
  • The fuel filter water drain cock was opened while the engine was running.

If one or more of the above occurred, air has entered the fuel system and you will need to prime the system prior to operating the vehicle.
    Fig 1: View Of Vent Valve Screw
    GM1871601Courtesy of GENERAL MOTORS CORP.
  1. Prior to priming the fuel system, ensure that the following has been completed:
    • There is fuel in the fuel tank.
    • The fuel filter has been installed and properly tightened.
    • The fuel lines are properly connected.
    • The fuel filter is cool to the touch.
    • Any dirt or debris has been removed from the fuel filter adapter and vent valve screw.
  2. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
  3. Open the vent valve screw (1) by turning the screw counterclockwise several full turns.
    4. Fig 2: View Of Priming Pump
    GM1871603Courtesy of GENERAL MOTORS CORP.
  4. Operate the priming pump (1) by repeatedly pumping until a small amount of fuel seeps from the vent valve. Allow the pump to fully return upward between pumps. When fuel is present, the filter is full of fuel and the system is primed.
  5. Close the vent valve screw.
  6. Clean any fuel which accumulated on the fuel filter adapter.
  7. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
  8. Start the engine and allow the engine to idle for a few minutes.
  9. Check the fuel system for leaks.
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

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.