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What are the power requirements of the motor on your grain drier?
You stated that the gas looked like it was boiling. Was the gas actually hot?
Did you have the genset in an enclosed area, or was it sitting in the open, with plenty of ventilation?
Gas in the cylinder and gas in the crankcase are both signs of a bad carburetor - the float is not closing the needle all the way. But in your case, if the tank had that much pressure on it, it could easily have caused that.
I can not come up with a single explanation for the tank to be building up that much pressure, though, unless the engine were just running so hot that it heated the tank up. But if the gas were actually boiling, the tank would have gotten hot enough to melt.
Since this unit is brand new, I highly suggest you get it to an authorized Generac service center for evaluation.