Katerina Swanson
If you're looking to replace the fuel filter on your 2008 GMC Sierra Duramax Diesel, you've come to the right place. This is a simple task that can save you money and ensure your truck runs well. Before beginning, make sure to drain the remaining fuel from the fuel filter and dispose of it safely. You'll also need to gather the necessary tools, such as a trim fastener removal tool or a flathead screwdriver, and a wrench, deep socket, or pliers. Now, let's dive into the step-by-step process of replacing your fuel filter.
| Characteristics | Values |
|---|---|
| Difficulty | Easy to do yourself |
| Cost | Original filters can be purchased for a fraction of the dealer cost |
| Tools | Trim fastener removal tool, flathead screwdriver, wrench, deep socket, or pliers |
| Steps | Drain the fuel from the fuel filter, disconnect the water-in-fuel sensor wiring, remove the fuel filter from the fuel filter adapter, install the new fuel filter, prime the engine |
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What You'll Learn
Drain the fuel filter
To drain the fuel filter of a 2008 GMC Sierra, first drain the remaining fuel out of the fuel filter and dispose of it safely. Make sure that the old gasket isn’t stuck to the fuel filter head. Using a wrench, deep socket, or pliers, remove the water-in-fuel sensor assembly from the bottom of the filter. If your new fuel filter comes with an o-ring for the water-in-fuel sensor assembly, replace the old o-ring with the new one. If the water in the fuel sensor assembly is damaged, it will need to be replaced with a new one—it cannot be reused.
Lubricate the new o-ring with clean engine oil before installing it. If your new fuel filter comes with a new gasket, replace the old gasket with the new one, and lubricate the new gasket with clean engine oil before installing it.
To prime the engine, first, correct any condition that caused the loss of prime. Turn the ignition on for 30 seconds without starting the engine. The fuel pump will start priming. Turn the ignition off, then back on, and crank the engine for 15 seconds. If the engine does not start, repeat these steps until the engine starts. If the engine does not start after repeating these steps three times, turn the ignition off for 60 seconds. Repeat the above steps until the engine starts. If the engine starts but does not run smoothly, increase the engine speed slightly. If the engine starts and runs but stalls, turn the ignition off for 60 seconds. When the engine starts, let it idle for a few minutes and check the filter for any leaks.
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Disconnect the water-in-fuel sensor
Disconnecting the water-in-fuel sensor is a crucial step in replacing the fuel filter of your 2008 GMC Sierra Diesel. Here is a detailed, step-by-step guide on how to do it:
Firstly, ensure that the water-in-fuel sensor wire does not get tangled during the process. Before disconnecting the sensor, you must drain the remaining fuel from the fuel filter. Dispose of the drained fuel responsibly. Make sure that no part of the old gasket is stuck to the fuel filter head.
Now, you can proceed to disconnect the water-in-fuel sensor wiring pigtail from the engine wiring harness electrical connector. You can use a wrench, deep socket, or pliers to remove the water-in-fuel sensor assembly from the bottom of the filter. If the water-in-fuel sensor assembly is damaged in any way, it is important to replace it with a new one. You cannot reuse it.
If your new fuel filter comes with an O-ring for the water-in-fuel sensor assembly, replace the old O-ring with the new one. Lubricate the new O-ring with clean engine oil before installing it. Similarly, if your new fuel filter comes with a new gasket, replace the old gasket with the new one and lubricate it with clean engine oil.
Finally, install the new fuel filter by reversing the removal process. Do not fill the new filter with fuel. You will prime it after installation.
Please note that this guide assumes a basic understanding of car mechanics and tool usage. Always refer to official repair manuals or seek professional assistance if you are unsure about any steps or procedures.
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Remove the air cleaner outlet duct
To remove the air cleaner outlet duct, follow these steps:
- Open the vent valve screw by turning it counterclockwise several full turns.
- Operate the priming pump until a small amount of fuel comes out of the vent valve. Allow the pump to fully return upward between pumps.
- Close the vent valve screw once fuel is present and the filter is full.
- Clean any fuel that may have accumulated on the fuel filter adapter.
The next step after removing the air cleaner outlet duct is to install a new one.
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Install a new fuel filter
To install a new fuel filter in a 2008 GMC Sierra diesel, follow these steps:
Firstly, ensure that you have drained any remaining fuel from the old fuel filter and disposed of it safely. It is important to check that the old gasket is not stuck to the fuel filter head. Using a wrench, deep socket, or pliers, remove the water-in-fuel sensor assembly from the bottom of the filter. If your new fuel filter comes with a new O-ring for the water-in-fuel sensor assembly, replace the old one, lubricating the new O-ring with clean engine oil before installing.
Next, if your new fuel filter comes with a new gasket, replace the old gasket, again lubricating the new one with clean engine oil. Now, install the new fuel filter, following the reverse order of removal. Do not fill the new filter with fuel; you will prime it after installation.
To prime the engine, first, correct any condition that caused the loss of prime. Turn the ignition on for 30 seconds, but do not start the engine—the fuel pump will start priming. Turn the ignition off, then back on, and crank the engine for 15 seconds. If the engine does not start, repeat these steps until it does. If, after repeating these steps three times, the engine still does not start, turn the ignition off for 60 seconds, and then repeat the above steps.
Once the engine starts, let it idle for a few minutes and check the fuel system for any leaks.
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Check for leaks
After replacing the fuel filter, it is important to check for leaks. Before starting the engine, slide underneath the truck to check for leaks. Once satisfied, start the engine. If the engine stalls, repeat the priming process. Once the engine starts, continue to inspect for fuel leaks. If the engine runs rough for the first 30 seconds but does not smooth out after a minute, re-bleed the system and repeat the pumping process.
If there are no leaks, or if the leak is on the filter housing, the fuel filter housing will need to be changed. If there is an air leak in the system, the fuel system will lose its prime. In this case, check that the fuel line from the tank to the filter housing is good and tight, and that there are no leaks.
Priming the engine can help to eliminate air in the fuel lines. To do this, first correct any condition that caused the loss of prime. Turn the ignition on for 30 seconds without starting the engine. The fuel pump will start priming. Then, turn the ignition off and back on, and crank the engine for 15 seconds. If the engine does not start, repeat these steps until it does. If the engine starts but does not run smoothly, increase the engine speed slightly. If the engine starts and runs but stalls, turn the ignition off for 60 seconds. When the engine starts again, let it idle for a few minutes and check the filter for any leaks.
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