crawl under your truck, lay on your side and stare at the gas tank. Situate yourself so you are by the drive shaft looking to the driver side of the frame rail. if you follow the fuel line, there is a black canister thingy, this is the fuel filter. It's kind of tucked into the frame rail, and it blends in a little bit but you will see the fuel line enter and exit. It is kind of cone shaped on one end.