This is a year late, but you will need to disassemble the unit and loosen the two screws under the air filter that hold down the carburetor so it can be moved out a little to give access to the throttle. The longer straight part of the linkage fastens to the orange handle through the side that is notched. The other end connects to the throttle on the carburetor. I'm guessing it came loose while you were replacing the fuel line. You'll need a set of star drives, phillips and flat head screwdrivers and a socket wrench for the spark plug.