Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSOLDSMOBILE2004BRAVADA AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 996 (ENGINE CONTROLS - 6.6L (LLY) (INTRODUCTION))REPAIR INSTRUCTIONSFUEL SYSTEM PRIMING
2004 Oldsmobile Bravada AWD
Fuel System Priming
2004 Oldsmobile Bravada AWDSECTION Fuel System Priming
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
In order for the DURAMAX 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:
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.
- 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.
- Prior to priming the engine, 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 head and vent valve.
- Open the vent valve by turning the screw counterclockwise several full turns.
- Operate the priming pump until a small amount of fuel seeps from the vent valve. Allow the pump to return upward between pumps. When fuel is present, the filter is full of fuel and the system should be primed.
- Close the vent valve.
- Clean any fuel which accumulated on the fuel filter.
- Start the engine and allow it to idle for a few minutes.
- Check the filter for leaks.
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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.