Katerina Swanson
The Duramax engine is a diesel engine used in Chevrolet and GMC trucks. Like any engine, the Duramax requires regular fuel filter changes. The fuel filter is located underneath the hood on the passenger side of the engine. This process can be done in less than 10 minutes, and there are many DIY videos available online. However, some people prefer to take their trucks to a dealer to ensure the job is done correctly. The cost of a fuel filter change at a dealer is around $230.
| Characteristics | Values |
|---|---|
| Fuel filter location | Underneath the hood near the firewall on the passenger side of the engine |
| Tools required | Panel clip remover, Water In Fuel sensor wrench (or channel locks), 1/2 inch Nut driver, 2-stroke oil |
| Fuel filter replacement procedure | 1. Remove pins holding the inner fender well liner with a panel clip remover. 2. Loosen the Bleeder screw with a 1/2 inch nut driver. 3. Prime the fuel filter until Diesel Fuel comes out. 4. Tighten the Bleeder screw and keep pumping the primer until it becomes hard to pump. |
| Fuel filter replacement interval | Every 15,000 miles for 2001-2010 models; every 22,500 miles for 2011-2016 models |
| Fuel filter cost | Around $83 for A/C Delco fuel, air, and cabin filters |
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What You'll Learn
Duramax fuel filter replacement
The fuel filter on a Duramax is located underneath the hood near the firewall on the passenger side of the engine. To replace the Duramax fuel filter, you can follow these steps:
- Pop the hood and sit by the passenger-side tire, looking at the fender well.
- Using a panel clip remover, remove the pins holding the inner fender well liner to the truck.
- With the pins removed and the wire harnesses pulled out, set the liner aside and locate the fuel filter.
- Using a Water In Fuel (WIF) sensor wrench or channel locks, remove the WIF sensor.
- Remove and discard the old o-rings and replace them with the new ones that come with the new filter.
- Lubricate the large o-ring and the outer edge of the filter where the o-ring will be placed with some 2-stroke oil. Also, lubricate the little o-ring on the WIF sensor.
- Put the Fuel Filter and WIF sensor back together and reinstall them into the truck. This step might be frustrating as it is in an awkward position, so be patient when threading the filter back on.
- Tighten the filter as recommended (1/3 to 1/2 turn after the seal has made contact).
- Loosen the bleeder screw with a 1/2 inch nut driver without taking it out completely, just enough to let air out.
- With the bleeder screw loosened, start priming the fuel filter. This will take a while, and you will hear air coming out of the screw. Eventually, diesel fuel will come out.
- When diesel fuel comes out, press down on the primer pump and hold it, then tighten the bleeder screw with your other hand (be careful not to over-tighten).
- After tightening the screw, continue pumping the primer until it becomes very hard to pump.
- Finally, wrestle back on the inner fender liner and start the truck.
Some people prefer to change their fuel filters from underneath the hood without removing the inner fender liner. This method might be more comfortable for some, but it is essential to ensure that the filter is tightened correctly and that all o-rings are lubricated properly to prevent leaks.
It is also worth noting that some Duramax owners choose to install a lift pump and bypass the factory fuel filter. This can be done by routing the fuel lines directly to the CP3 intake fuel lines or using a bypass adapter purchased online. However, keeping the factory filter system is recommended due to the priming mechanism.
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Duramax fuel filter location
The Duramax fuel filter is located underneath the hood near the firewall on the passenger side of the engine. To access the fuel filter, you will need to remove the pins holding the inner fender well liner to the truck using a panel clip remover. With the liner removed, you will have a clear view of the fuel filter from the passenger side.
Once you have located the fuel filter, you can proceed to replace it. First, disconnect the WIF connector and let it hang. You can then unscrew the fuel filter and remove it. It may be possible to do this by hand, but if not, you can use a strap wrench. Properly dispose of the contents inside the filter, and then remove and discard the old o-rings.
Next, lubricate the new filter's o-ring with 2-stroke oil, as well as the outer edge of the filter where the o-ring will be placed. Reinstall the WIF sensor, ensuring that the little o-ring is also lubricated. Tighten the filter as recommended (1/3 to 1/2 turn after the seal has made contact).
Now, return to the engine and locate the filter pump and bleeder screw. Loosen the bleeder screw with a 1/2 inch nut driver, just enough to let air out. With the screw loosened, begin priming the fuel filter, which may take several pumps. You will know it is primed when you hear diesel fuel coming out. At this point, press down on the primer pump and tighten the bleeder screw.
Finally, continue pumping the primer until it becomes very difficult to pump. Your fuel filter has now been successfully changed, and you can reattach the inner fender liner.
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Duramax fuel filter priming
The Duramax fuel filter is located underneath the hood near the firewall on the passenger side of the engine. To prime the Duramax fuel filter, first loosen the bleeder screw with a 1/2 inch nut driver. Be careful not to remove it completely, just loosen it enough to let air out. With the bleeder screw loosened, you can start priming the fuel filter. This process can take a while, so be patient. You will hear air coming out of the screw, and eventually, diesel fuel will start to come out. When this happens, press down on the primer pump and hold it, then tighten the bleeder screw with your other hand. Make sure not to over-tighten it. After tightening the screw, continue pumping the primer until it becomes very difficult to pump. At this point, the fuel filter has been successfully primed.
It is worth noting that some Duramax owners have reported issues with the factory fuel filter, leading them to install aftermarket solutions such as a FASS (Fuel Air Separation System) pump and filter or a lift pump. These modifications can improve filtration and address issues such as frequent priming requirements and leaks. However, even with aftermarket setups, some owners have experienced "change fuel filter" errors on their dashboards, which may be due to air leaks or other factors.
When replacing or priming the Duramax fuel filter, it is important to use the correct tools and follow the recommended procedures. The tools required for changing the fuel filter include a panel clip remover, a Water In Fuel (WIF) sensor wrench or channel locks, and a 1/2 inch nut driver. Lubrication with 2-stroke oil is also necessary for the O-rings. Additionally, it is important to replace the O-rings with new ones provided with the new filter and to properly tighten the filter according to the manufacturer's recommendations.
In some cases, persistent priming issues may be caused by problems with the filter head, supply lines, or low-pressure lines. Replacing these components, such as installing a new filter housing with a primer, can help resolve priming issues. It is recommended to consult a Duramax forum or a mechanic specializing in Duramax engines for specific advice and troubleshooting steps if you encounter any problems during the priming or replacement process.
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Duramax fuel filter maintenance
Location and Tools:
The Duramax fuel filter is located underneath the hood, near the firewall on the passenger side of the engine. To access it, you will need to remove the inner fender liner or fender well liner. This can be done using a panel clip remover to detach the pins holding it in place. While working, ensure that the water-in-fuel sensor wire does not become entangled.
Removal and Replacement:
To remove the old fuel filter, rotate it counter-clockwise, being careful not to spill any fuel. Drain the removed filter and check if the gasket is stuck to the fuel filter housing flange. Using a wrench, socket, or pliers, remove the water-in-fuel sensor assembly from the bottom of the fuel filter. Replace the O-ring on this assembly, and lubricate it with clean engine oil before installing it onto the new fuel filter. Do not overtighten. Lubricate the new fuel filter gasket and install it at the top of the fuel filter assembly.
Priming the Fuel Filter:
Before installing the new fuel filter, it is important to prime it. Loosen the bleeder screw with a 1/2 inch nut driver, but do not remove it completely. You will need to pump the primer pump multiple times until you hear air coming out of the screw, and eventually, diesel fuel will start to come out. Tighten the bleeder screw, and continue pumping the primer until it becomes very hard to pump.
Bleeding the Fuel System:
For Duramax diesels from 2001 to 2016, which lack an electric lift pump, it is crucial to bleed the fuel system of air after installing a new filter. To do this, locate the bleed valve on the driver's side of the fuel priming pump and open it. Pump the plunger on the top of the fuel filter housing until all air escapes and diesel fuel flows out of the bleed screw orifice. Tighten the screw, clean up any spills, and start the engine to check for leaks.
Maintenance Intervals:
GM recommends replacing the fuel filter at specific intervals. For Duramax models from 2001 to 2010, the suggested interval is 15,000 miles, while for 2011 to 2016 models, it is recommended to replace the filter every 22,500 miles or as prompted through the instrument cluster display. Some owners choose to change their filters at lower mileage or whenever they notice the filter looks dirty.
Additional Tips:
When replacing the fuel filter, remember to use the new O-rings provided with the new filter and lubricate them with 2-stroke oil. Additionally, ensure that the water-in-fuel sensor connector does not become entangled during installation. It is also recommended to keep the OEM filter if you are using an additional fuel pump, as it can be useful for pressurizing the system in case of any issues with the additional pump.
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Duramax fuel filter cost
The cost of a Duramax fuel filter varies depending on the model of your vehicle and where you purchase the replacement filter. For example, a 3.0 Duramax fuel filter can cost around $240 CAD at a dealership, whereas the same filter can be purchased for half the price at Napa.
It is important to note that replacing a Duramax fuel filter can be done in less than 10 minutes and does not require removing anything from the truck. This task can be performed by following online tutorials and how-to videos available on YouTube.
To replace the filter, you will need tools such as a panel clip remover, a Water In Fuel (WIF) sensor wrench or channel locks, a 1/2 inch nut driver, and 2-stroke oil to lube up the O-rings. The filter is typically located underneath the hood near the firewall on the passenger side of the engine.
Additionally, it is recommended to replace the Duramax fuel filter every 10,000 miles, or every 15,000 to 20,000 miles with a good pre-filtration system.
Some Duramax vehicles may also be equipped with an auxiliary heated fuel filter kit, which includes a new filter base, a high-flow fuel heater, a Water-In-Fuel (WIF) sensor, and a spin-on canister-style filter. These kits can be purchased for specific Duramax models and provide additional benefits, such as tackling cold temperatures and preventing fuel gelling.
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Frequently asked questions
It is recommended that you change the fuel filter on your Duramax every 15,000 miles for 2001 to 2010 models, and every 22,500 miles for 2011 to 2016 models. However, some people choose to change their filters every other oil change, or at around 10,000 miles.
You will need a panel clip remover, a Water In Fuel sensor wrench (or channel locks), a 1/2 inch Nut driver, and 2-stroke oil to lube up the o-rings.
First, locate and open the bleed valve towards the driver's side of the fuel priming pump. Then, repeatedly pump the plunger on the top of the fuel filter housing until all air escapes and diesel fuel begins to flow out of the bleed screw orifice. Close the bleed screw without overtightening, as it is made of plastic.
