Mercedes Mullins
Replacing the fuel filter in a 2008 GMC Sierra is a straightforward task that can be completed with a few tools and some basic mechanical knowledge. It's important to replace the fuel filter regularly to keep the truck running well and to prevent contaminated fuel from damaging the injectors. In this article, we will cover the tools required, the steps to replace the fuel filter, and some tips to make the process easier.
| Characteristics | Values |
|---|---|
| Tools | Trim fastener removal tool, or a flathead screwdriver, wrench, deep socket, or pliers |
| Steps | Remove the center air intake tube between the air filter housing and the turbocharger, remove the passenger side inner fender, open the bleed valve fuel filter head, pump the plunger on top of the fuel filter housing, drain the remaining fuel out of the fuel filter and dispose of it, remove the water-in-fuel sensor assembly from the bottom of the filter, lubricate the new gasket with clean engine oil before installing it, install the new fuel filter in the reverse order of removal, prime the new filter after installation, reinstall the inner fender and intake tube, start the engine, slide underneath your truck to check for leaks |
| Notes | Be careful not to over-tighten the bleed valve, do not fill the new filter with fuel, replace the old gasket with the new one if it comes with a new gasket, replace the o-ring with the new one if the new fuel filter comes with an o-ring for the water-in-fuel sensor assembly, lubricate the new o-ring with clean engine oil before installing it, if the water in the fuel sensor assembly is damaged, replace it with a new one |
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What You'll Learn
Tools needed: trim fastener removal tool, flathead screwdriver, wrench, deep socket, pliers
To replace the fuel filter on a 2008 GMC Sierra, you will need a trim fastener removal tool or a flathead screwdriver, a wrench, a deep socket and pliers.
First, you will need to open the bleed valve fuel filter head and pump the plunger on top of the fuel filter housing. Keep going until all the air escapes and the fuel starts to flow out of the bleed valve. When that happens, close the bleed valve. Be careful not to over-tighten it.
Next, remove the centre air intake tube between the air filter housing and the turbocharger. You will need a trim fastener removal tool or a flathead screwdriver for this. Then, remove the passenger side inner fender.
Now, drain the remaining fuel out of the fuel filter and dispose of it. Make sure that the old gasket isn’t stuck to the fuel filter head. With a wrench, deep socket, or pliers, remove the water-in-fuel sensor assembly from the bottom of the filter. If the new fuel filter comes with a new gasket and an o-ring for the water-in-fuel sensor assembly, replace the old gasket and o-ring with the new ones. Lubricate the new gasket and o-ring with clean engine oil before installing them.
Finally, reinstall the inner fender and intake tube. Start the engine and slide underneath your truck to check for leaks. The engine will run rough for the first 30 seconds. If it doesn’t smooth out after about a minute, re-bleed the system and repeat the pumping process.
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Draining the fuel 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 and lubricate it with clean engine oil. If the water in the fuel sensor assembly is damaged, it will need to be replaced with a new one. You cannot reuse it.
After draining the fuel filter, you can move on to the next steps of replacing the fuel filter. Open the bleed valve fuel filter head and pump the plunger on top of the fuel filter housing. Keep pumping until all the air escapes and the fuel starts to flow out of the bleed valve. Once this happens, close the bleed valve, being careful not to over-tighten it.
Finally, reinstall the inner fender and intake tube. Start the engine and slide underneath your truck to check for leaks. The engine will run rough for the first 30 seconds, but if it doesn't smooth out after about a minute, you will need to re-bleed the system and repeat the pumping process.
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Removing the water-in-fuel sensor assembly
To remove the water-in-fuel sensor assembly, you will need a wrench, deep socket, or pliers. First, drain the remaining fuel out of the fuel filter and dispose of it. Then, with your tool of choice, remove the water-in-fuel sensor assembly from the bottom of the filter. If the water-in-fuel sensor assembly is damaged, it will need to be replaced with a new one. You can't 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 and lubricate it with clean engine oil before installing it.
It is also important to check that the old gasket isn't stuck to the fuel filter head. 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 before installing it.
It is easiest to replace the whole fuel filter housing as a unit, so you don't have to remove the filter first. However, if you are replacing the fuel filter, it is important to also check for leaking seals in the fuel filter head. You can rebuild the head, but it is much simpler and faster to replace the entire fuel filter housing, which includes the head, filter, and water-in-fuel sensor.
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Lubricating the new gasket
First, ensure that the new fuel filter comes with a new gasket. If it does, carefully remove the old gasket from the fuel filter head, being cautious not to damage the surface. It is important to make sure that the old gasket is not stuck to the fuel filter head.
Next, take the new gasket and apply a thin layer of clean engine oil to its surface. This lubrication will help create a tight seal and ensure the gasket functions optimally. Be careful not to over-lubricate, as this could lead to leakage.
Once the gasket is adequately lubricated, carefully position it onto the fuel filter head. Make sure that it is properly aligned and seated securely in place.
After installing the new gasket, proceed with the rest of the fuel filter replacement process. Remember to prime the new filter after installation, but do not fill it with fuel beforehand.
By following these steps and paying close attention to the lubrication of the new gasket, you can help ensure a proper seal and prevent potential fuel leaks in your GMC Sierra.
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Reinstalling the inner fender and intake tube
To reinstall the inner fender and intake tube, first, you need to open the bleed valve fuel filter head. Then, pump the plunger on top of the fuel filter housing until all the air escapes and the fuel starts to flow out of the bleed valve. Close the bleed valve, being careful not to over-tighten it. Now, you can reinstall the inner fender and intake tube. Start the engine and slide underneath your truck to check for leaks. The engine will run rough for the first 30 seconds, so if it doesn't smooth out after about a minute, you should re-bleed the system and repeat the pumping process. It is easiest to replace the whole fuel filter housing as a unit, so you don't have to remove the filter first.
Before you reinstall the inner fender and intake tube, make sure that the old gasket isn't stuck to the fuel filter head. If it is, remove it with a wrench, deep socket, or pliers. If your new fuel filter comes with a new gasket, replace the old gasket with the new one. Lubricate the new gasket with clean engine oil before installing it.
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Frequently asked questions
You will need a trim fastener removal tool or a flathead screwdriver.
You should replace your fuel filter on schedule to get the full life out of your injectors and keep your truck running well. However, if you are experiencing drivability problems, this could be caused by leaking seals in the fuel filter head.
Make sure the old gasket isn't stuck to the fuel filter head. If it is, remove it with a wrench, deep socket, or pliers. Then, replace it with the new gasket that comes with your new fuel filter, lubricating it with clean engine oil before installing.
Open the bleed valve fuel filter head and pump the plunger on top of the fuel filter housing until all the air escapes and the fuel starts to flow out of the bleed valve. Then, close the bleed valve, being careful not to over-tighten it, and start the engine.
