Al,

I did have it happen to me on a Brison 3.2. It had a bad pump diaphram and only after the first start and while fueling it I would see drips coming from the carb while pumping the fuel in, thankfully the carb was pointed to the side so it would not flood it. I got home that day and took the pump side apart and found a tear in it which was keeping the needle off it's seat.

The really weird part was the engine ran very well for 4 flights that day and then on the 5th one it started to run really badbut I had noticed it dripping on the 2nd flight and thought "what the heck"