I have a 36" JD walk behind, that is leaking gas out of the dump bowl. I bought a carbuerator kit for it, replaced the float needle and gaskets, I also replaced the dump bowl. After I take the bowl off, and replace the rubber ring around it, it stops leaking for about a day or two, then starts again. What should I do? It also has trouble starting. I think it is flooded every time I start it. I take the air filter off and there is gas filled up in the carbeurator???