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The fuel filter in a 2015 GMC Sierra can be found under the truck, specifically on the driver's side of the frame near the front tire. You can either use a jack to elevate the truck for access or remove the wheel well to see it. A replacement fuel filter typically ranges from $30 to $60. If you prefer a professional to install it, the total expense would be around $200 to $300.
In the 2015 GMC Sierra, you can find the fuel filter on the left side of the frame right behind the front wheel.