Capn Z,
For future reference, you are better off having a full tank of gas, or no  
gas at all in the tank compared with only 1/3 tank. A full tank will not  
accumulate moisture, nor will the empty tank. (Vent closed of course) It always  
helps to have the air vent open when running the engine :)
If you do decide to keep a full tank over the long, cold northern winter,  be 
sure to add some Stabil to the gas.
 
Rummy