Where is the fuel filter located on an 2006 gmc sierra 1500?

On a 2006 GMC Sierra 1500, the fuel filter is located on the frame rail, near the fuel tank, on the driver's side. It's usually within a few feet of the tank, but the exact position might vary slightly depending on the specific engine and configuration of your truck. You'll likely need to get under the truck to locate it. It's typically a cylindrical canister.