well it's not the fuel tank, we sent it in and had it cleaned out and relined. I know its not a venting problem because we drove it on the weekend with the gas cap off and it still did it. Let it sit for awhile, then got a boost, and it fired right back up. don't think it is icing up because it did the same thing last summer. Rerouted the fuel line becuase we thought the fuel might be boiling in the fuel line or carb. When it did it on the weekend, i checked and the fuel pump was full of gas, it is brand new too. Talking about scratching your head, AhHHHHHHH.Talked to one mechanic, and made a suggestion about putting a heat sheild under the carb, not sure about that one. Engine is not heating up running a 180 thermostat, and guage is showing its not heating up. Getting really frustrating.