I have a Redmax blower that runs great except when it sits out in the sun. It will generally start easily, but when I try to give it throttle, it just won't take the fuel. It spits and sputters and dies. If you can keep it running long enough to get it cooled off, it will run fine. (I think it is the carb that needs cooling) It is not a problem with exhaust or the coil. The exhaust is clean and the coil is new. All coil problems I have ever had would stop the unit while it was running and the coil got hot. The problem never shows up while the engine is running. It only occurs after the engine is of and sitting in the sun. I have tried opening the gas tank vent to make sure there was not a stopped up vent, but that doesn't make a change. The factory tech said there might be a stopped up vent for the carb. I haven't been able to find this vent. Any suggestions are appreciated. THanks.