the fuel is leaking from the carb cuz the float needle is not sealing good against its seat when the float pushes against it.... remove and examine it very closely....even a slight amount of dirt on the seat will cause it to overflow.... maybe you can scrape it off (don't use anything sharp or hard ! ).... if it's not stuck on crud you will have to buy a new needle and/or seat..... prob $20..... the most painless way to get at the carb on a PA is to get some rope or tiedowns and suspend the ped with the stand just off the ground.... then remove that big bolt thru the frame right above the carb..... then carefully hoist the frame up a little till you can swing the frame out of the way to get to the carb...... be carefull of the cables ! !