Can anybody solve this hot start issue? I'm out of ideas!

Have ya ever gone to the gas station and remove the gas cap, while it's hissing at ya? With a full exhaust system, the pipes run directly beside the tank and will heat the fuel, pretty good. Found out that our Duster tank vent was plugged, becaused it blew fuel at me that way. Any pressure in the gas tank will screw up the carb float setting.