Ameer Randolph
Replacing the fuel filter on an lly Duramax is a straightforward task that can be completed with the right tools. The fuel filter is located underneath the hood near the firewall on the passenger side of the engine. To replace the fuel filter, you will need to remove the pins holding the inner fender well liner to the truck, disconnect the WIF connector, and then unscrew and remove the fuel filter. You will also need to dispose of the contents inside the filter properly and replace the o-rings.
| Characteristics | Values |
|---|---|
| Location of fuel filter | Underneath the hood near the firewall on the passenger side on the engine |
| Tools needed | Panel clip remover, Water In Fuel sensor wrench (or channel locks), 1/2 inch Nut driver, 2-stroke oil to lube up the o-rings |
| First steps | Pop the hood, sit by the passenger side tire looking at the fender well, use the panel clip remover to remove the pins holding the inner fender well liner to the truck |
| Next steps | Disconnect the WIF connector, unscrew and remove the fuel filter, dispose of the contents inside the filter properly, remove the WIF sensor |
| Final steps | Drain the filter, verify that the gasket did not stick to the fuel filter housing flange, remove the water-in-fuel sensor assembly, replace the o-ring on the water-in-fuel sensor assembly |
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What You'll Learn
Locating the fuel filter
To locate the fuel filter on a Duramax, open the hood and look underneath near the firewall on the passenger side of the engine. You should be able to see the filter pump and bleeder screw. You will need to remove the pins holding the inner fender well liner to the truck using a panel clip remover. With the pins removed, you can pull out the wire harnesses and set the liner aside to get a better view of the fuel filter.
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Removing the pins and wire harnesses
To remove the pins and wire harnesses, you will need a panel clip remover. Start by popping the hood and sitting by the passenger side tire, looking at the fender well. Using the panel clip remover, remove the pins that are holding the inner fender well liner to the truck. Once all the pins have been removed and the wire harnesses pulled out, set the liner aside. This will give you a good view of the fuel filter from the passenger side. Now disconnect the WIF connector and let it hang. You can then unscrew the fuel filter and remove it.
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Disconnecting the WIF connector
First, make sure you have the necessary tools, including a panel clip remover, a Water In Fuel (WIF) sensor wrench or channel locks, and a 1/2 inch Nut driver. You may also want to have some 2-stroke oil to lube up the o-rings.
Now, pop the hood and position yourself by the passenger side tire, looking at the fender well. Using the panel clip remover, remove the pins holding the inner fender well liner to the truck. With all the pins removed and the wire harnesses pulled out, set the liner aside. This will give you a clear view of the Fuel Filter.
At this point, you can disconnect the WIF connector. Let it hang, and then proceed to unscrew the fuel filter. You may be able to do this by hand if you are strong enough, or you can use a strap wrench, which can be found at any auto parts store. Be careful not to entangle the water-in-fuel sensor wire while unscrewing the filter. Keep the filter upright until it is removed from the vehicle to prevent fuel spills.
Once the fuel filter is removed, properly dispose of the contents inside the filter. Then, using a WIF wrench or channel locks, remove the WIF sensor. Remember to replace the o-rings with the new ones provided with the new fuel filter.
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Unscrewing the fuel filter
To replace the fuel filter on an lly duramax, you'll need to 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 all the pins removed, pull out the wire harnesses from the liner and set it aside. Now you'll have a good view of the fuel filter. Disconnect the WIF connector and let it hang. You can now unscrew the fuel filter and remove it. You might be able to do this with your hands if you're strong enough, otherwise, you can use a strap wrench. Be sure to keep the filter positioned upright until it's removed from the vehicle to ensure fuel is not spilled. Drain the filter once removed and verify that the gasket did not stick to the fuel filter housing flange.
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Draining the filter
To drain the filter, you must first disconnect the WIF connector and let it hang. Then, you can unscrew the fuel filter and remove it. You might be able to do this with your hands, but if not, you can use a strap wrench, which can be found at any auto parts store. Dispose of the contents inside the filter properly.
Next, using a WIF wrench or channel locks, remove the WIF sensor. Make sure that you also remove and discard the old o-rings. The new filter should come with new o-rings.
To remove the fuel filter, rotate it counter-clockwise (as if you were looking from the bottom up). Be sure 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 ensure that fuel is not spilled.
Once the filter is removed, drain it and verify that the gasket did not stick to the fuel filter housing flange.
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Frequently asked questions
Underneath the hood near the firewall on the passenger side of the engine.
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.
Disconnect the WIF connector and let it hang. Then, unscrew the fuel filter and remove it. You might be able to do this by hand, but if not, use a strap wrench.
Drain the filter once removed and dispose of the contents inside the filter properly. Then, remove the water-in-fuel sensor assembly from the bottom of the fuel filter using a wrench, socket, or pliers.
