Sylvie Willis
Changing the fuel filter on a 2005 Duramax is a straightforward process that can be done at home, saving you a trip to the dealer. The fuel filter is located underneath the hood near the firewall on the passenger side of the engine. To change the fuel filter, you will need a few tools, including a panel clip remover, a Water In Fuel (WIF) sensor wrench, and a 1/2 inch nut driver. You will also need some 2-stroke oil to lubricate the O-rings. The process involves removing the inner fender well liner, disconnecting the WIF connector, unscrewing and removing the old fuel filter, lubricating and installing the new fuel filter, and then bleeding the fuel system to remove any air.
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What You'll Learn
Locating the fuel filter
To locate the fuel filter on a 2005 Duramax, you must first pop the hood and sit by the passenger side tire, looking at the fender well. Using a panel clip remover, you can then remove the pins holding the inner fender well liner to the truck. With the pins removed and the wire harnesses pulled out, you can set the liner aside and get a good view of the fuel filter.
The fuel filter is located underneath the hood, near the firewall, on the passenger side of the engine. It is positioned below the air intake tube. To access it, you will need to remove the centre air intake tube, which is located between the air filter housing and the turbocharger inlet mouthpiece.
You will then need to remove the passenger side inner fender, which is secured by a series of plastic body clips. This will give you a clear view of the fuel filter. It is a large, obvious component.
You can also access the fuel filter from underneath the hood, going from the top. This approach may be easier for some, as it can be hard to reach when going from underneath.
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Removing the inner fender
First, locate the inner fender on the passenger side of the engine, below the air intake tube. You will need to remove the centre air intake tube to access it better. The inner fender is usually secured by a series of plastic body clips or pins. Using a panel clip remover, carefully remove these clips or pins. Be gentle to avoid breaking them, as they are prone to breakage and may need to be replaced.
Once all the clips or pins are removed, carefully set them aside. Now, you can gently pull out the inner fender. Take your time with this step to avoid damaging any wires or components connected to the fender. With the fender removed, you will have clear access to the fuel filter and its components.
It is important to note that some people choose to access the fuel filter from the wheel well, avoiding the need to remove the inner fender. However, removing the inner fender provides a more direct and open access to the fuel filter, making the replacement process easier.
After completing the fuel filter replacement, you can reinstall the inner fender by simply snapping the plastic clips or pins back into place. Ensure all wire harnesses are properly secured and routed before reinstalling the fender.
Remember to wear appropriate safety gear, such as gloves and eye protection, during the removal and installation process.
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Disconnecting the WIF connector
First, locate the WIF connector. It is usually found near the fuel filter, which is situated underneath the hood on the passenger side of the engine, close to the firewall. To access it, you may need to remove the passenger-side inner fender wheel well guard or liner. This can be done using a panel clip remover to remove the pins holding the liner in place.
Once you have located the WIF connector, it's time to disconnect it. Be careful not to damage any wires or components during this process. Loosen the connection by gently pulling or twisting, being mindful of the water-in-fuel sensor wire to ensure it doesn't become entangled. You may need to wiggle the connector free, taking care not to strain any attached wires.
After disconnecting the WIF connector, let it hang safely aside so that it doesn't interfere with the rest of the process. Ensure that it is clear of any moving parts and won't be damaged as you continue with the fuel filter change.
Now that the WIF connector is safely disconnected and set aside, you can proceed with the next steps of changing the fuel filter. It is important to note that you should not overtighten any components during reassembly and that lubrication may be required for certain parts, as per the manufacturer's recommendations.
Remember to consult a qualified mechanic or a detailed step-by-step guide if you are unsure about any aspect of the process. Safety should always be a priority when working on your vehicle.
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Unscrewing the fuel filter
To begin the process of changing the fuel filter on a 2005 Duramax, you will first need to pop the hood and take a seat by the passenger side tire. You will be looking at the fender well. Using a panel clip remover, you can then remove the pins holding the inner fender well liner to the truck. With the liner removed, you will have a clear view of the fuel filter.
Now, you can begin the process of unscrewing the fuel filter. First, disconnect the Water In Fuel (WIF) connector and let it hang. You might be able to do the next part with your hands if you are strong enough, but otherwise, you can use a strap wrench or a filter wrench. Now, unscrew the fuel filter and remove it. Be sure that the WIF wire does not become entangled while unscrewing the filter. Keep the filter positioned upright until removed from the vehicle to ensure fuel is not spilled.
Dispose of the contents inside the filter properly. Now, you can move on to removing the WIF sensor. The new filter should come with new O-rings, so make sure to remove and discard the old ones. Lubricate the O-rings and the outer edge of the filter with 2-stroke oil or clean engine oil.
Now you are ready to install the new fuel filter.
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Lubricating the o-rings
Firstly, remove the old o-rings and discard them. Take the new o-rings that came with the replacement fuel filter. Lubricate the big o-ring and the outer edge of the filter where the o-ring will be placed with 2-stroke oil. Be generous with the amount of oil used.
Next, replace the small o-ring on the WIF sensor, ensuring that it is also lubricated. The WIF sensor wrench can be used to remove and replace the WIF sensor. It is important not to overtighten the sensor when reinstalling it.
With the o-rings lubricated and the WIF sensor securely in place, the fuel filter is now ready to be reinstalled into the truck. Ensure that the WIF sensor connector does not become entangled during the reinstallation process. Hand-tighten the fuel filter only, and do not use tools to tighten it further.
After the fuel filter is installed, locate and open the bleed valve towards the driver's side of the fuel priming pump. If desired, the bleed screw can be removed to inspect the o-ring. 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. Tighten the bleed screw, ensuring it is not overtightened, as it is made of plastic. Clean up any spills to easily detect leaks.
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Frequently asked questions
The 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 passenger side inner fender wheel well guard.
You will need 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 lubricate the o-rings.
First, unplug the wiring harness from the WIF sensor on the bottom of the filter. Then, unscrew and remove the filter. Lubricate the new o-rings with 2-stroke oil and install them onto the WIF sensor and the new filter. Screw the new filter into place and tighten it. Loosen the bleeder screw and pump the hand primer until diesel comes out, then put the screw back in.
