Sylvie Willis
If you want to test the fuel filter on your 2006 Duramax, you will need to reset the fuel filter life system. This can be done either by using the steering wheel controls or following a manual procedure. If your vehicle has steering wheel controls, press and hold the select button for 5 seconds while the FUEL FILTER LIFE message is displayed. This message will appear on the Driver Information Center (DIC) for 10 seconds. If your vehicle does not have steering wheel controls, simply start the engine, and the message will no longer be displayed. Additionally, you can test the fuel pressure at the large Schrader valve using a specialized fuel pressure gauge that can measure higher pressures than typical gasoline engines.
| Characteristics | Values |
|---|---|
| Fuel filter reset | Press and hold the select button for 5 seconds while the FUEL FILTER LIFE message is displayed |
| Fuel filter life reset for vehicles without steering wheel controls | The message will not be displayed the next time the engine is started |
| Fuel filter life reset issues | Fuel filter life indicator does not reset after a fuel filter change |
| Bleeding the fuel lines | Use the hand primer on the top of the filter housing and bleed screw to bleed |
| Priming the new filter | Push the button on top of the fuel filter until it is hard to push, then crack the bleeder with a screwdriver |
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What You'll Learn
Resetting the fuel filter life system
- Turn on the ignition: The 'fuel filter' message will be displayed on the dashboard, indicating that a reset is required.
- Press and hold the brake and gas pedals simultaneously for 10 seconds.
- A 'fuel filter life reset' message will appear, confirming that the reset process has been initiated.
- Turn off and turn on the ignition again.
- Repeat the previous step: Press and hold the gas and brake pedals together for another 10 seconds to complete the reset.
- The 'fuel filter' message should no longer illuminate on the dashboard, indicating that the fuel filter life system has been successfully reset.
It is important to note that if your vehicle has steering wheel controls, you can reset the fuel filter life system by pressing and holding the select button for 5 seconds while the 'FUEL FILTER LIFE' message is displayed. This message will typically appear on the driver information center (DIC) for about 10 seconds.
Additionally, if you encounter any issues or if the 'fuel filter' message persists even after resetting, it is advisable to consult a mechanic. They may suggest changing the filter or performing further diagnostics to ensure the optimal performance of your vehicle's fuel system.
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Bleeding the fuel lines
Locate the Fuel Filter and Bleeder Screw: Start by locating the fuel filter, which is usually found in the engine compartment on the passenger side or in front of the fuel tank on the driver's side frame rail. Identify the bleeder screw on the fuel filter.
Loosen the Bleeder Screw: Using a suitably sized screwdriver, loosen the bleeder screw. Be careful not to use a screwdriver that is too small, as it may damage the screw.
Priming the Fuel System: Prime the fuel system using a primer pump or the hand primer button on top of the filter housing. Push the primer pump or button repeatedly until you see fuel coming out of the bleeder screw. This step ensures that the fuel lines are filled with fuel and free of air.
Tighten the Bleeder Screw: Once fuel starts coming out of the bleeder screw, tighten the screw securely.
Pumping the Primer: After tightening the bleeder screw, continue pumping the primer about 15 more times or until the primer becomes noticeably harder to push. This step helps build up pressure in the fuel system.
Reconnect Electrical Connections: Reconnect any electrical connections that were previously unhooked during the process. Ensure that all connections are secure.
Clean Up Fuel Spills: Wipe up any spilled fuel from the engine head or frame rail to prevent any safety hazards.
Start the Engine: Attempt to start the engine. If the engine dies after a few seconds, it may indicate that air is still present in the fuel system. In this case, repeat the bleeding process from the previous steps.
Check for Leaks: Finally, check for any fuel leaks in the system. Ensure that all connections are secure and that there are no signs of fuel leakage.
It is important to note that diesel fuel tends to be inherently foamy, so it is crucial to check the seals in the pump housing and take necessary precautions, such as using a Viton rebuild kit, to prevent air from entering the fuel system. Additionally, ensure that the nylon flex lines, filter, and other components are not damaged or loose, as this can also lead to air intrusion and fuel pressure issues.
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Using a fuel pressure tester
To test the fuel filter on a 2006 Duramax using a fuel pressure tester, you will need a specialised fuel pressure gauge that can measure much higher pressures than those typically found in gasoline engines. Fuel pressure tester kits for Duramax engines can be purchased from most auto parts stores or online retailers.
The Duramax engine has a low and high-side fuel system. The high side runs at 6000-26,000 psi, so a standard fuel pressure tester will not work. The low side runs under vacuum as the injection pump sucks the fuel from the tank.
To test the fuel pressure, locate the Schrader valve. The Schrader valve may have fuel and air bubbles sitting in it, which could indicate a leak elsewhere in the system. To release the air, prime the engine, then push open the Schrader valve to bleed out the air.
It is also important to check the fuel supply lines, as the rubber feed hose coming from the tank is known to collapse under suction from the fuel pump over time.
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Priming the new filter
To prime the new filter on a 2006 Duramax, you must first locate the bleeder screw. This is usually found on the passenger side under the hood, on the fuel filter assembly. The bleeder screw should be hand-tightened, as over-tightening can cause leaks.
Next, you need to pump the primer cylinder until it becomes hard to push down. You may need to do this several times, and it can take a while. You should see a special fitting sticking out of the primer pump housing. You can connect this to a bleeder ball to help with the process.
Once the cylinder is hard, crack the bleeder screw to let the air out. You may need to use a WIF wrench for this. Then, tighten the screw and repeat the process until fuel comes out and the engine stays running. It may take a few cycles of starting and stopping, but it will eventually run smoothly.
If you are having trouble priming the filter, there are a few things you can check. First, ensure that there are no leaks in the system. You can do this by taking off the suction line to the filter head and cycling the primer. If there is a vacuum, then you have a supply line problem. If not, then the primer may be faulty or there could be a filter leak. Another potential issue is a clog in the line or a collapsed draw tube. This can be diagnosed by putting air into the tank and checking if any fuel or air comes out of the bleeder screw. If not, then there is a clog or collapse somewhere in the line.
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Bleeding the air out of the fuel test port
To bleed the air out of the fuel test port, you must first prime the filter. There is a button on top of the fuel filter that is a hand primer—push down on it until it's hard to push. Then, crack the bleeder, which is a hex-headed plastic cap with a screwdriver slot. Keep hand-pumping and then cracking the bleeder until there is no air.
Hand-pump and bleed the air out of the fuel test port—this is a giant-sized tire valve on the passenger front of the engine. Once you have removed all the air, hand-pump until the primer is hard to push, then start the engine.
You can also use the hand primer on the top of the filter housing and the bleed screw to bleed the air out. Then, hand-prime and bleed at the fuel test port. Hand-prime until you can't pump anymore, then start the engine.
To check for air, prime, crack the bleeder, and check for air. Repeat this process until all the air is gone.
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Frequently asked questions
For vehicles with steering wheel controls, press and hold the select button for 5 seconds while the FUEL FILTER LIFE message is displayed. This message will appear on the driver information center (DIC) for ten seconds. For vehicles without steering wheel controls, the message will no longer be displayed the next time the engine is started.
You will need to bleed the fuel lines. Use the hand primer on the top of the filter housing and bleed screw to do this, then hand-prime it and bleed at the fuel test port on the passenger front of the engine.
You will need a specialized fuel pressure gauge that can measure much higher pressures than what is typically found in gasoline engines. You can find fuel pressure tester kits for Duramax engines at most auto parts stores or online retailers.
You will need to test the fuel pressure at the large Schrader valve.
