Hello I am having a new-to-me problem with my carb's. The rear carb ( 65 122s B18D) float bowl cover has sprung a leak so to speak. Where the fuel enters the cover about 3/8 of an inch lower there is a hole(vent I assume) that the fuel has started to flow out of strongly. Previous to this starting I had removed both floats and cleaned the needles and seats(with carb cleaner and compresed air) due to a sticking needle. With finger pressure the needle seams to seat. At this time I also removed the sludge at the bottom of the float-bowls. What did I do wrong? Any thoughts?