Mercedes Mullins
If you're looking to remove the fuel filter on your Duramax engine, it's likely because you've installed an aftermarket fuel filtration system and no longer need to worry about servicing the factory fuel filter. This is a fairly straightforward process, but there are a few things to keep in mind. First, make sure you have the right tools and that your engine is compatible with the process—the steps outlined here are for 6.6L Duramax engines from 2001 to 2016. You'll want to start by locating the fuel filter and draining the fuel water separator. From there, you can remove the fuel filter and replace it with a fuel filter delete kit, which will allow you to bypass the factory fuel filter altogether.
Characteristics and Values Table for Removing Fuel Filter Duramax
| Characteristics | Values |
|---|---|
| Fuel filter removal | Rotate counter-clockwise, ensuring the water-in-fuel sensor wire doesn't tangle |
| Drain the filter | Remove and verify gasket didn't stick to fuel filter housing flange |
| Water-in-fuel sensor assembly | Remove with wrench/socket/pliers; replace o-ring; lubricate with clean engine oil |
| Fuel filter replacement | Lubricate gasket with clean engine oil; install at the top of the fuel filter assembly |
| Installation | Ensure water-in-fuel sensor connector doesn't tangle; install snug by hand, not tools |
| Location | Passenger side of the engine, below the air intake tube |
| Applicable models | 2001-2016 Duramax diesel; 2001-2010 trucks: replace at 15,000 miles; 2011-2016 trucks: replace at 22,500 miles |
| Notes | Remove center air intake tube; remove passenger side inner fender; attach 1/4" fuel hose to drain valve |
| Open bleed screw; pump plunger until air escapes and diesel flows out; close bleed screw | |
| Start engine and check for leaks | |
| Reasons for removal | Leaking air; causing fuel issues or no-start issues; prone to leaks over time |
| Aftermarket options | FASS Titanium Series; Airdog; AFE |
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What You'll Learn
Remove the fuel filter by rotating counter-clockwise
To remove the fuel filter on a Duramax engine, you must first locate it. On a 6.6L Duramax, the fuel filter is located on the passenger side of the engine, below the air intake tube. Once you have located the fuel filter, follow these steps to remove it:
First, remove the centre air intake tube, which is located between the air filter housing and the turbocharger inlet mouthpiece. Next, remove the passenger side inner fender, which is secured by a series of plastic body clips. This step is optional, but it will provide better access to the fuel filter. Now, you are ready to remove the fuel filter itself.
Remove the fuel filter by rotating it counter-clockwise, as if you were looking at it from the bottom up. It is important to be careful during this step to ensure that the water-in-fuel sensor wire does not become entangled while unscrewing the filter. Keep the filter positioned upright until it is removed from the vehicle to prevent fuel spills. Once the filter is removed, be sure to drain it and verify that the gasket did not stick to the fuel filter housing flange.
After the filter is removed, you will need to remove the water-in-fuel sensor assembly from the bottom of the fuel filter using a wrench, socket, or pliers. This assembly should not be reused if it is damaged. Now, you are ready to install the replacement fuel filter.
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Drain the filter and check the gasket
To drain the filter, first, pull the passenger side fender well on the front. You will need a 7mm socket, 10mm socket, and a pair of needle nose pliers. The filter is right in front of you. It is a big white or black thing with a white drain at the bottom and a wire coming out of it. Unplug the wire and use a pair of channel locks to open the drain cock. It is best to use an empty water bottle to see what you are draining out. Most likely, the water will be brown and dirty. Drain until you get clear fuel out. After snugging up the drain, go to the top side of the filter and find the bleeder screw on the filter head. Open that and use the primer bulb until you have solid fuel coming out. Put it all back together and you should be good.
After draining the filter, you need to check the gasket. To do this, first, remove the water-in-fuel sensor wire from the bottom of the fuel filter using an appropriate wrench, socket, or pliers. Then, check the gasket to make sure it did not stick to the fuel filter housing flange. If the gasket did stick, you will need to remove it carefully. Once the gasket is removed, inspect it for any damage or debris. If the gasket is damaged, you will need to replace it with a new one. If it is just dirty, you can clean it with a soft brush or cloth. Make sure the gasket is completely dry before reinstalling it.
It is important to note that the gasket is crucial in creating a tight seal between the fuel filter and the fuel filter housing. This seal prevents fuel leaks and ensures that the fuel system functions properly. Therefore, it is essential to inspect the gasket regularly and replace it if necessary.
Additionally, when reinstalling the gasket, it is recommended to lubricate it with clean engine oil before installation. This will help create a better seal and prolong the life of the gasket. Once the gasket is lubricated, carefully position it onto the fuel filter assembly, ensuring that it is properly aligned and seated. Finally, reinstall the water-in-fuel sensor assembly, making sure to tighten it securely, but not overtighten it, as this can damage the threads or the sensor itself.
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Remove the water-in-fuel sensor assembly
To remove the water-in-fuel sensor assembly from a Duramax engine, you will need to follow these steps:
First, locate the water-in-fuel (WIF) sensor. The WIF sensor is usually found at the bottom of the fuel filter. It is attached to the fuel filter and has a 2-wire connector that transmits whether the sensor detects water in the fuel.
Next, disconnect the old WIF sensor. You can use an appropriate wrench, socket, or pliers to remove it. Make sure to also check the wires coming out of the bottom of the sensor for any signs of damage, as they can sometimes break or become exposed, causing the sensor to malfunction.
Once the old sensor is disconnected, you can remove it from the fuel filter. Be careful not to overtighten the new sensor when installing it. Lubricate the new O-ring with clean engine oil and install it snugly onto the new fuel filter. Do not overtighten it.
Finally, install the replacement fuel filter, ensuring that the water-in-fuel sensor connector does not become entangled with its surroundings. Again, this should be installed snugly by hand and not tightened with tools.
It is recommended to replace the fuel filter and drain the fuel water separator at regular intervals, depending on the model year of your Duramax engine. For 2001 to 2010 models, GM recommends doing this every 15,000 miles, while for 2011 to 2016 models, it is recommended every 22,500 miles or as prompted through the instrument cluster display.
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Replace the o-ring on the water-in-fuel sensor
To replace the o-ring on the water-in-fuel sensor of a Duramax engine, you will need to first locate the fuel filter. It is situated underneath the hood near the firewall on the passenger side of the engine.
Once you have located the fuel filter, you will need to remove it. To do this, you will need a panel clip remover, a Water In Fuel sensor wrench (or channel locks), and a 1/2 inch nut driver. Remove the pins holding the inner fender well liner to the truck with the panel clip remover. With the liner removed, you will have a clear view of the fuel filter. Loosen the bleeder screw with the 1/2 inch nut driver, but do not take it out completely—just enough to let air out. Now, start priming the fuel filter, and continue until you hear air coming out of the screw and diesel fuel starts to come out. Then, press down on the primer pump and tighten the bleeder screw. Remember not to over-tighten the screw. Keep pumping the primer until it becomes very hard to pump.
Now that the fuel filter has been changed, you can move on to the water-in-fuel sensor. Using a WIF wrench (or channel locks), remove the WIF sensor assembly from the bottom of the fuel filter. If the assembly is damaged, do not reuse it. The new filter should come with a new o-ring, so remove and discard the old one. Lubricate the new o-ring with clean engine oil and install it snugly onto the new fuel filter, ensuring that you do not overtighten it.
Finally, lubricate the new fuel filter gasket with clean engine oil and install it at the top of the fuel filter assembly. Do not fill the filter with diesel fuel. The fuel filter housing has an integrated hand pump that will be used to pump diesel from the fuel tank into the filter. Install the replacement fuel filter, ensuring that the water-in-fuel sensor connector does not become entangled with its surroundings. Install snugly by hand only, without using any tools.
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Lubricate the water-in-fuel sensor o-ring
Lubricating the water-in-fuel sensor o-ring is an important step in maintaining your Duramax engine. It ensures a proper seal and helps prevent leaks, which can cause performance issues and damage to the engine. Here is a step-by-step guide on how to lubricate the water-in-fuel sensor o-ring:
Step 1: Prepare the Necessary Lubricant
Before you begin, make sure you have the appropriate lubricant on hand. It is recommended to use clean engine oil for lubricating the o-ring. This oil should be free of contaminants and suitable for use in engines. You can also use 2-stroke oil, which is specifically designed for lubrication in engines. Some people also use diesel fuel to wet the o-ring, but it is important to ensure that your hands and the surrounding area are clean to prevent any dirt or debris from entering the system.
Step 2: Access the Water-in-Fuel Sensor
Locate the water-in-fuel sensor assembly, which is typically found near the fuel filter. In some Duramax engines, it is located underneath the hood near the firewall on the passenger side of the engine. You may need to remove certain components, such as the inner fender well liner, to access the sensor assembly. Make sure to consult a repair manual or seek guidance from a qualified mechanic if you are unsure about the specific location and steps required to access the sensor.
Step 3: Remove the Old O-Ring
Before lubricating the new o-ring, it is important to remove the old one. Using a Water In Fuel (WIF) sensor wrench or channel locks, carefully remove the WIF sensor and take out the old o-ring. Dispose of the old o-ring properly, as it cannot be reused. Check for any debris or residue on the sensor assembly and ensure that the surface is clean before installing the new o-ring.
Step 4: Lubricate the New O-Ring
Take the new o-ring, which should be provided with the new fuel filter, and apply a generous amount of clean engine oil or 2-stroke oil to it. Coat the entire surface of the o-ring, ensuring that it is well-lubricated. This will help create a tight seal and facilitate easy installation.
Step 5: Install the Lubricated O-Ring
Once the o-ring is sufficiently lubricated, carefully install it onto the water-in-fuel sensor assembly. Make sure that it is seated correctly and snugly in place. Do not overtighten the o-ring, as this can damage it and affect the seal.
By following these steps and paying attention to the specific recommendations for your Duramax engine, you can effectively lubricate the water-in-fuel sensor o-ring, helping to ensure the proper functioning of your fuel system and maintaining the overall health of your engine.
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Frequently asked questions
You may want to remove the factory fuel filter if you have installed an aftermarket fuel filtration system, such as FASS, Airdog, or AFE, and your factory fuel filter is located after your new filtration system.
Removing the factory fuel filter can prevent fuel-related issues and no-start issues caused by air leaks, and you won't have to worry about servicing it ever again.
Here are the general steps to remove the fuel filter on a Duramax:
- Remove the center air intake tube and the passenger side inner fender.
- Remove the fuel filter by rotating it counter-clockwise, ensuring that the water-in-fuel sensor wire does not become entangled.
- Drain the filter and verify that the gasket did not stick to the fuel filter housing flange.
- Remove the water-in-fuel sensor assembly from the bottom of the fuel filter using a wrench, socket, or pliers.
- Replace the o-ring on the water-in-fuel sensor assembly and lubricate it with clean engine oil before installing it onto the new fuel filter.
- Lubricate the new fuel filter gasket with clean engine oil and install it at the top of the fuel filter assembly.
