I had an issue on a farmall m that my dad had. I cleaned the carb and set the float as it should be. I put it all back together and wouldn"t run worth a hoot. Took it apart and cleaned the jets etc. about 3 different times. When I went to assemble it the fourth time I noticed that the float hit the side of the fuel bowl. As I assembled it it was like the carb was full of fuel. I bent the float so that it didn"t hit the sides and ran like a charm. It might be something to look at?