Help! I took the top off of my carb to adjust the float level (it was too high) while I was in there I put a new needle and seat, power piston and diaphragm pump. I put it back together and the float level was right in the middle of the view window. The truck runs great but every time I shut it off and let it sit for a hour or more, the gas drains out of the float bowl and it takes 2 or 3 min. of cranking to get the gas back into the bowl to get it to start. WTF?