Had this problem the other day, the carb was flooding over when I came to a stop actually died on me a couple of times. Gas was dripping through the carb venturi. This started all of a sudden. I was on my way to put gas in due to it being really low. When I took the gas cap off there was a lot of pressure that was released. It flooded some after I put gas in but then it ran fine the rest of the way home. (about 3 miles) Could the pressure build up force gas through the carb even with the motor off? I thought I had a vented cap. I have not seen this happen before. I 've had the carb for about 3 years same one tha was on the old motor w.manual fuel pump. This is the 1st experience w/elec fuel pump which is rated at 5-7psi. What part does the outside temp play with this also. It was fairly warm that day.