Ameer Randolph
The Duramax fuel filter is a diesel fuel filter that comes equipped with GM model trucks. The filter is responsible for keeping sediments from the diesel out of the fuel injectors. If sediments get inside the injectors, the diesel won't be dispersed properly throughout the engine. To prime a 2008 Duramax fuel filter, you must first park the truck in a well-ventilated location and turn the steering wheel clockwise until it stops. Next, turn the engine off, open the hood, and prop it up with the locking rod. Then, reach through the front passenger side wheel well and remove the plastic guard from the rear of the wheel well. Now, the fuel filter is visible and accessible. After locating the water sensor on the bottom of the fuel filter, follow the attached wires to the plug near the passenger side valve cover and unplug it. Position the water sensor plug and wires so they hang below the fuel filter and place a drip pan under the truck. Loosen the fuel filter with a strap wrench, finish unscrewing it with your hands, and place it on the passenger side frame rail near the fuel filter housing. Fill the new fuel filter with fresh diesel and lower it through the engine compartment. Screw the fuel filter onto the fuel filter housing and finish tightening with the strap wrench. Turn the fuel filter one-half turn to properly seat the new fuel filter. Move back to the top side of the engine and open the relief valve on the fuel filter housing by turning it counter-clockwise. Allow the diesel to bleed out of the relief valve hole. Prime the new fuel filter by pushing the black primer cap until the diesel starts to run out of the relief valve. Close the relief valve and turn the ignition to the accessory position for about 15 seconds.
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What You'll Learn
Troubleshooting a Duramax that won't prime
Check for Air Leaks:
Start by checking for any air leaks in the system, as air leaks are a common cause of priming issues. Pay close attention to the O-rings, as they are crucial for maintaining a proper seal. Ensure that the O-rings are properly seated in their channels and inspect them for any signs of damage, such as dry rot or cracks. If the O-rings are not intact or are misaligned, replace them with new ones.
Inspect the Fuel Filter and Housing:
The fuel filter and housing assembly should be your next area of focus. Check if the fuel filter is properly seated and secured. Remove and reinstall the filter, ensuring that the O-rings are in place and undamaged. If the fuel filter housing shows signs of damage, such as cracks or perforations, replace it with a new one.
Bleed the Fuel System:
Bleed the fuel system by loosening the bleeder screw (but not removing it) and turning over the engine. You can also try pumping the priming pump repeatedly to build pressure, then opening the screw to release air, repeating this process until fuel comes out. If your Duramax has a lift pump, you may need to consider installing one if it doesn't already have one.
Check the Lift Pump:
If your Duramax is equipped with a lift pump, ensure that it is functioning correctly. A faulty lift pump can cause priming issues. Check for any signs of damage or leaks and replace the pump if necessary.
Seek Professional Assistance:
If you've tried the above steps and are still experiencing priming issues, it may be time to seek professional assistance. A qualified mechanic can perform a more thorough diagnosis and recommend appropriate repairs. They may suggest additional troubleshooting steps or identify specific parts that need replacement.
Remember to refer to your Duramax's specific model and year for more accurate guidance, as some procedures may vary. Always exercise caution when working on your vehicle and refer to reliable resources or seek expert advice if you're unsure about any steps.
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Replacing the fuel filter
Park your 2008 GM model truck in a well-ventilated location and turn the steering wheel clockwise until it stops. This will position the front wheels to the far right, making it easier to reach the fuel filter.
Turn the engine off and open the hood, propping it up with the locking rod. Reach through the front passenger-side wheel well and remove the plastic guard from the rear of the wheel well. The plastic guard is connected by small plastic clips that can be pried off with a flat-head screwdriver. Pull the guard out and place it on the ground. The fuel filter is now visible and accessible.
Locate the water sensor at the bottom of the fuel filter and follow the attached wires to the plug near the passenger-side valve cover. Unplug the plug and position the water sensor plug and wires so they hang below the fuel filter. Position a drip pan under the truck in the area of the fuel filter.
Slide the fuel filter strap wrench about halfway up the fuel filter. Turn the strap wrench counter-clockwise to loosen the fuel filter, then finish unscrewing it with your hands. Place the old fuel filter on the passenger-side frame rail near the fuel filter housing.
Fill the new Duramax fuel filter with fresh diesel. Lower the new fuel filter through the engine compartment down to the passenger side frame rail. Move back to the front passenger side wheel well and screw the fuel filter onto the fuel filter housing. Turn the fuel filter clockwise to tighten. Finish tightening the fuel filter with the strap wrench. Turn the fuel filter one-half turn to properly seat the new fuel filter.
Move back to the top side of the engine and open the relief valve on the top side of the fuel filter housing by turning it counter-clockwise. This will allow the diesel to bleed out of the relief valve hole. Prime the new fuel filter by pushing in on the black primer cap on top of the fuel filter until the diesel starts to run out of the relief valve. Close the relief valve.
Finally, turn the ignition to the accessory position for about 15 seconds.
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Seating the new fuel filter
Now, to seat the new fuel filter, turn the fuel filter one-half turn. Move back to the top side of the engine and open the relief valve on the top side of the fuel filter housing. Turn the relief valve counter-clockwise to open it. This will allow the diesel to bleed out of the relief valve hole.
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Bleeding the fuel system
Step 1: Accessing the Fuel Filter
Park your 2008 Duramax in a well-ventilated area and turn the steering wheel clockwise until it stops. This manoeuvre positions the front wheels to the far right, providing easier access to the fuel filter through the front wheel well opening. Turn off the engine and open the hood, propping it up with the locking rod. Reach through the front passenger side wheel well and remove the plastic guard covering the rear of the wheel well by prying off the small plastic clips with a flat-head screwdriver. With the plastic guard removed, the fuel filter will be visible and accessible.
Step 2: Preparing for Bleeding
Locate the water sensor at the bottom of the fuel filter and carefully unplug it. Ensure that the water sensor plug and wires are positioned safely, hanging below the fuel filter. Place a drip pan under the truck, directly below the fuel filter, to catch any diesel fluid that may leak during the bleeding process.
Step 3: Bleeding the Fuel Filter
Loosen the fuel filter using a strap wrench by turning it counter-clockwise. Finish unscrewing the fuel filter with your hands and carefully set it aside. Obtain a new fuel filter and fill it with fresh diesel fuel. Lower the new fuel filter to the passenger side frame rail and screw it securely onto the fuel filter housing, turning it clockwise to tighten. Once the new fuel filter is in place, open the relief valve on the top side of the fuel filter housing by turning it counter-clockwise. This step allows any trapped air or diesel fuel to bleed out of the relief valve hole.
Step 4: Priming the Fuel Filter
To prime the new fuel filter, push in on the black primer cap located on top of the fuel filter. Continue pushing until diesel fuel starts to run out of the relief valve. Once the fuel filter is adequately primed, close the relief valve and turn the ignition to the accessory position for approximately 15 seconds.
It is important to note that proper seating of the fuel filter and ensuring that all O-rings are correctly installed is crucial to preventing air leaks in the Duramax fuel system. Bleeding the fuel system and priming the fuel filter helps ensure optimal fuel flow and engine performance in your 2008 Duramax.
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Rebuilding the fuel filter head
There are several repair kits available on the market, including the Merchant Automotive Master Filter Head Kit, which includes new O-rings, a billet aluminium water-in-fuel (WIF) plug, a billet aluminium filter head spacer kit, a billet aluminium bleeder screw, and an OEM replacement fuel filter. This kit costs around $100. There is also a basic kit available from Merchant Automotive that costs around $20 and includes replacement O-rings.
Before purchasing a kit, it is recommended to check for common issues that cause the Duramax to lose its prime. This includes checking for rocks stuck between the fuel lines and the frame, and checking for hairline cracks in the plastic bleeder screw.
If you plan to rebuild the filter assembly yourself, set aside a couple of hours and be sure to practice safe shop techniques. After rebuilding and reinstalling the filter assembly, you will need to prime the fuel system before starting the truck. Prime the system by pumping the primer plunger repeatedly until it becomes firm, and then start the engine. After starting, make a thorough check for fuel leaks before driving the truck.
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