Sylvie Willis
If you own a vehicle with a push-button start, you may have encountered issues with priming the fuel filter. This is a known problem with certain Duramax engines, with some owners reporting that they have to prime the fuel filter by pumping the push button on each start. This issue is not unique to Duramax; it has also been observed in some Ram and Cummins vehicles. While there does not seem to be a definitive solution, some owners have shared possible workarounds, such as pressing the start button multiple times without pressing the brake, or holding down the power button to enter diagnostic mode.
| Characteristics | Values |
|---|---|
| Duramax Model | 3500 Silverado (6.6L Duramax) |
| 3.0 Duramax | |
| 2003 Siverado 2500HD with Duramax | |
| 2005 Duramax | |
| 2013+ Ram HD Cummins | |
| Action to Prime | Hold down the power button to go into diagnostic mode |
| Press the "push to start" button without depressing the brake pedal until the "Run" light over the "Push to start" button lights up | |
| Press the start button like 30 times in a row without pressing the brake | |
| Press the start button once while in park with the ignition off and the driver's foot on the brake pedal | |
| Crack the bleed screw, use the output side of a shop vac to gently pressurize the filter neck until fuel comes out the bleeder, close, prime until stiff, start |
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What You'll Learn
The importance of priming the fuel filter
Priming the fuel filter is especially important after replacing the fuel filter or when the engine runs out of fuel. This is because contaminants can build up on the filter, restricting fuel flow to the engine and causing a drop in performance. By priming the fuel filter, you can ensure that the system is properly filled and that there is no air left inside, allowing your diesel engine to run smoothly.
Additionally, priming the fuel filter can help prevent potential damage to your engine. When the fuel system is drained or runs empty, air pockets can form and cause issues with the engine's performance. Priming the fuel filter is the only way to effectively remove these air pockets and ensure that the engine has the necessary fuel to operate efficiently.
In some cases, not priming the fuel filter may not cause any immediate issues. However, it is always better to be safe than sorry. By taking the time to prime the fuel filter, you can mitigate the risk of potential issues and ensure the longevity of your vehicle's engine.
Overall, priming the fuel filter is a necessary procedure that should not be skipped. It ensures the proper functioning of your vehicle's engine and can help prevent issues caused by air pockets and fuel restriction. By understanding the importance of priming the fuel filter, you can maintain the optimal performance and health of your vehicle.
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How to prime a Duramax fuel filter
To prime a Duramax fuel filter, you need to first crack the bleed screw. Then, use the output side of a shop vac to gently pressurize the filter neck until fuel comes out of the bleeder. Close it once the fuel starts coming out, prime until stiff, and then start the engine.
Another method is to cycle the ignition to "run" twice and then start the engine as normal. To do this, push the "push to start" button without depressing the brake pedal until the "Run" light over the "Push to start" button lights up. You will hear the fuel pump running to build pressure. Do that a couple of times, then start the engine normally.
If you have a push-button start without a brake pedal, you can try the following: push the start button once while in the park and with the ignition off, and while your foot is on the brake pedal. The vehicle will then crank and start automatically after the Wait to Start time has elapsed.
If you have an older Duramax model such as the 2003 LB7, you may need to prime the fuel filter manually using the bleeder and button on the filter head.
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Troubleshooting common issues
If you are experiencing problems with your Duramax fuel filter and push-button start system, there are several potential causes and solutions to consider.
Firstly, check for any air leaks in your fuel system, as this is a common issue. Air leaks can occur in the fuel filter mount, allowing air to suck in through dry-rotted hoses or cracks in the fuel filter housing. Inspect the fuel filter outlet head hose, the fuel filter to FICM hose, and the fuel feed hose for any signs of damage or deterioration. If you discover any issues, replace the affected hoses and consider rebuilding the fuel filter head with a new o-ring kit.
Another potential issue could be related to the filter itself. Ensure that you are using the correct filter for your vehicle. Some filters, such as the 1R-0750 and its equivalents, are not suitable as the only filter and do not function as water separators. Consider swapping to a better filter that can handle water separation. Additionally, if your vehicle requires an adapter for the filter, ensure that you have the correct one, as some filters require specific adapters due to thread differences.
If you are experiencing issues with priming the fuel filter, there are a few methods you can try. One method involves pressing the "push to start" button without depressing the brake pedal until the "Run" light illuminates. You should hear the fuel pump running to build pressure. Repeat this process a couple of times, and then start the vehicle normally. Alternatively, if your vehicle has a keyless push-button start, you can try the following: push the start button once while the vehicle is in park, with the ignition off and your foot on the brake pedal. The vehicle will automatically crank and start after the Wait to Start time has elapsed.
If your Duramax is cranking but failing to start, there could be an issue with the injectors. Check the oil level, and if it is overfull, the injectors may be leaking fuel into the crankcase. To confirm this, place a drop of oil on a clean piece of paper. If there is fuel in the oil, you will notice that the fuel wicks away from the oil drop. In this case, the injectors will need to be replaced.
By following these troubleshooting steps, you can identify and resolve common issues related to your Duramax fuel filter and push-button start system.
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The impact of not priming the filter
Failing to prime the filter can have several negative consequences. Firstly, it can result in air getting into the fuel system, which can cause the engine to stall or not start at all. This is because the engine requires a certain amount of fuel pressure to run properly, and if there is air in the system, it can disrupt this pressure and prevent the engine from getting the fuel it needs.
Additionally, not priming the filter can lead to issues with the fuel pump. The fuel pump is responsible for delivering fuel from the tank to the engine, and if it is not primed correctly, it can cause the pump to work harder than it should. This can lead to premature wear and tear on the pump, and in some cases, it may even cause the pump to fail prematurely.
Another potential issue is that not priming the filter can result in reduced fuel efficiency and performance. This is because the engine may not be getting the proper amount of fuel it needs to run optimally, which can lead to decreased power and fuel economy.
Furthermore, failing to prime the filter can cause damage to the fuel injectors. The injectors are precision components that require a specific fuel pressure to function correctly, and if the filter is not primed, it can lead to incorrect fuel pressure, resulting in potential damage to these critical components.
Finally, not priming the filter can lead to long-term damage to the engine itself. This is because the engine may not be getting the proper lubrication it needs from the fuel, which can cause increased wear and tear on the engine's internal components over time. Therefore, it is essential to ensure that the fuel filter is correctly primed to prevent these potential issues and maintain the proper functioning of the vehicle.
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Tips for preventing air from entering the system
Air in the fuel system can cause a variety of problems for both gasoline and diesel engines. It can lead to a decrease in engine power, breakdowns, engine slowdown, loss of power, difficulty starting the engine, fuel pump damage, and additional fuel system repair costs.
- Regularly carry out preventive maintenance: Check the condition of the fuel filter, fuel hoses, seals, and fuel pump. Replace any worn or damaged parts and ensure that the fuel filter is installed correctly and in accordance with the vehicle manufacturer's recommendations.
- Monitor the quality of fuel and use high-quality fuel. Poor quality fuel can increase the chance of air getting into the system.
- Keep the fuel tank filled during warm weather to minimize condensation and reduce the air space at the top of the tank.
- Check the fuel tank for water using water-finding paste, especially before each fill-up or at least annually. Pump out any water accumulation and pressure-clean the supply tubing if necessary.
- Ensure that the fill box is tight and in good condition, providing a dependable seal to prevent water from seeping in after rainfall.
- Inspect the fuel lines for any signs of wear or pinhole leaks, as these can cause air to enter the system instead of fuel.
- When replacing the fuel filter, use a feed pump to remove air from the system. Ensure that the filter is filled completely before applying the pump to avoid air in the system.
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Frequently asked questions
To prime your Duramax fuel filter with push-button start, first, press the "push to start" button without depressing the brake pedal until the "Run" light over the button lights up. You will hear the fuel pump running to build pressure. Do this a couple of times and then start the engine normally.
It depends on the model of your Duramax engine. For instance, the 2017+ models have an in-tank lift pump, so you only need to refill the filter and prime the system again by turning the key on and off for 2-3 cycles.
If you don't prime your Duramax fuel filter, your engine may not start, or it may run for a few seconds and then shut down.
Before attempting to prime your Duramax fuel filter with push-button start, ensure that the driver's door is closed. If it is open when you push the start button, the engine will try to start without pressure on the brakes.
