thing still under warranty???

If not I would first remove covers to look at the carb. IMO most likely it's the carb. leaking (loose mount screws, diaphramn covers, needle and float, crack, or outside change fuel line, but I dought it) Probably running down from the carb. which is mounted on top or towards the top on this model. I see no reason fuel leak under the flywheel. Only thing under their that would even remotely cause leak IMO (crank case leak) would be the screws holding the piston jug onto the crank sump.