Sylvie Willis
Owners of Silverado Duramax trucks have frequently reported issues with their fuel filter housing leaking. This is a common problem with high-mileage 2001-2016 Duramax trucks, which have a fuel system that differs from most other diesel vehicles. The leaks are often caused by cracked housings or dry and brittle seals, which can be easily and inexpensively fixed by replacing the filter head, filter, and water in the fuel sensor. However, some owners have also reported leaks from the heater plug or the primer, which can be addressed by replacing the O-ring or using a rebuild kit.
| Characteristics | Values |
|---|---|
| Cause of the leak | The O-rings in the filter head assembly can get pinched, torn, or dry and brittle, causing air to bleed into the system. |
| Symptoms of a leaking fuel filter | Extended cranking after the truck has been sitting for long periods, the engine starting and then dying, and the inability to restart the truck without manually priming it when parked on an incline. |
| Fix | Replace the O-rings, or the entire filter head assembly. Repair kits are available from Merchant Automotive for around $20-$100. |
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What You'll Learn
The O-rings in the filter head assembly can allow air to bleed into the system
The O-rings in the filter head assembly of a Silverado Duramax engine can allow air to bleed into the system, causing the fuel system to lose its prime. This can happen due to several reasons, including age, use of ULSD and biodiesel fuels, and improper installation.
Age and use of certain types of fuel can cause the O-rings to become dry, brittle, and cracked, allowing air to seep into the system. This can be prevented by regularly replacing the O-rings and using fuel additives that help lubricate the seals.
Improper installation of the O-rings can also cause leaks. It is important to ensure that the O-rings are not pinched or torn during installation, as this can create a pathway for air to enter the system. Coating the O-rings with fuel before installation can help prevent tears and improve the seal.
If you suspect that air is bleeding into the system through the O-rings, there are a few troubleshooting steps you can take. First, check for any external fuel leaks, as these can be a sign that the system is losing pressure. Next, pay attention to how your engine behaves when starting. If you notice extended cranking after the truck has been sitting for a long time, or if the engine starts and then dies, it may be due to air in the system.
To fix this issue, you have a few options. You can replace just the O-rings, or you can opt for a more comprehensive repair kit that includes new O-rings, a water-in-fuel plug, a bleeder screw, and other components. These kits are generally inexpensive and can be installed with basic mechanical skills and hand tools.
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Seals in the filter head can get dry and brittle and cause leaks
The filter head has several small seals, and as the truck ages, these seals can get dry and brittle and cause leaks. The seals in the filter head are not replaced when changing the filter. Seals can also get damaged during installation, so it's important to be careful when installing new seals.
There are several ways to address this issue. One solution is to replace the entire assembly, as suggested by GM dealers. However, Merchant Automotive offers more affordable repair kits that only require hand tools and basic mechanical skills to install. These kits range from $20 for replacement O-rings to $100 for the Master Filter Head Kit, which includes new O-rings, a billet aluminum water-in-fuel (WIF) plug, a billet aluminum filter head spacer kit, a billet aluminum bleeder screw, and an OEM replacement fuel filter.
Another option is to purchase a rebuild kit, which includes all the necessary seals and a new inlet/outlet hose. This kit can be purchased from the Duramax Store or from a vendor on the Duramax forum.
To prevent future leaks, it is recommended to coat the O-rings with fuel before installing them. Additionally, it is important to check for fuel leaks before driving the truck after making any repairs.
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The housing has been known to crack
If you suspect that your Duramax-powered truck is losing its prime, or you have seen evidence of fuel leaks from the filter head, you should address the problem as soon as possible. While your GM dealer will likely suggest replacing the entire assembly, there are less expensive solutions available, such as repair kits that require only hand tools and basic mechanical skills. These kits can range from $20 for replacement O-rings to $100 for a Master Filter Head Kit that includes new O-rings, a water-in-fuel plug, a filter head spacer kit, a bleeder screw, and an OEM replacement fuel filter.
It is important to note that the filter head has several small seals that are not replaced when changing the filter. As the truck ages, these seals can get dry and brittle and may leak. Therefore, it may be necessary to replace the entire filter head, filter, and water-in-fuel sensor. Additionally, when rebuilding a leaky Duramax head, it is recommended to use a billet aluminum bleeder screw instead of the factory-installed plastic bleeder screw, which is prone to stripping and cracking.
To complete the installation, the fuel system needs to be primed again, and the air must be purged from the system through the bleeder screw. This process may need to be repeated several times to ensure all air is removed from the system. After starting the truck, be sure to check for leaks before driving.
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The fuel heater connection can cause leaks
The O-ring can also get pinched and torn during installation, leading to leaks. To prevent this, some people coat the O-rings with fuel before installing them.
If you are experiencing a fuel leak from the heater connection, you will need to replace the O-ring. This can be done by purchasing a rebuild kit, which includes all the necessary seals and a new inlet/outlet hose. The kit typically costs around $20-$34, but more comprehensive options are available for up to $100.
It is important to address fuel leaks as soon as possible. Before driving your truck, you should always check for fuel leaks. Early signs of a leak include extended cranking after the truck has been sitting for long periods, as well as the engine starting and then dying. As the problem worsens, it may become impossible to restart the truck without manually priming it when parked on an incline.
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The drain plug in the housing can cause leaks
To fix this issue, you can replace the O-rings, which are available in repair kits starting at around $20. It is recommended to coat the O-rings with fuel before installing them to prevent leaks. Additionally, you can refer to how-to videos and guides available online for further assistance in repairing the fuel filter housing leak.
If you are unsure about the source of the leak, it is suggested to replace the entire filter head, filter, and water-in-fuel sensor simultaneously, as this is a relatively easy and inexpensive fix. It is also important to check for fuel leaks before driving the truck to ensure safety and prevent further issues.
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Frequently asked questions
Seals in the filter head can get dry and brittle with age and cause leaks. The O-rings in the filter head assembly can also allow air to bleed into the system, causing the fuel system to lose its prime.
You can either replace the entire assembly or use a repair kit. Repair kits can be purchased for around $20 and go up to around $100 for a Master Filter Head Kit.
Early signs of a leak include extended cranking after the truck has been sitting for long periods, as well as the engine starting and then dying. As the problem gets worse, it may become impossible to restart the truck without manually priming it when parked on an incline.
