I've got a Ryobi tiller that I got from a friend. I replaced the spark plug and put a new carb kit in the machine and it seemed to run ok but after I run it and turn it off it is like a vacuum sucking fuel into the engine and hydro locks it and fuel will pour out of the muffler when you turn it on its side. I was thinking maybe I hooked the fuel line up wrong but both lines run to the tank so I didn't think that could be it. Maybe I put in the carb kit wrong. Any ideas or suggestions?