I just picked up an old Craftsman Rototiller with a 6 hp engine. Model 912299360 and It will only run if I add gas into the Carburetor. I'm sure I can fix this with a thourogh cleaning. THe real probem I see is there is a small hole (looks like it's supposed to be there) in the top part of the carb on the right side that fuel just pours out of whether it's running or not. What can I do about this?