The fuel filter on a 2007 Chevrolet Express 1500 with the 4.8L engine is located
on the frame rail, near the fuel tank. It's usually toward the rear of the vehicle, but not directly on the tank itself. You'll likely need to get under the vehicle to access it. It's a cylindrical canister-type filter.
Because of the location and variations based on specific trim level and options, it's strongly recommended to consult your owner's manual or a repair manual specific to your vehicle. Pictures in a repair manual will be invaluable in pinpointing the exact location.
