I have a 38 mm bendix, butterfly valve and a zenith 40 mm butterfly vavle, going on a stock 72 flh. on the 40 mm zenith there is a smale hole in the bowl that goes into the acc. pump chamber. what is that for? question 2. there is no check ball under the acc pump jet, thought they had those, what is if anything. supposed to be under the acc. jet for the acc. pump. thanks in advance