[BigLew]

I'd have to do some checking of my thinking and maybe I can do that here.

Assume a fuel tank that is partially full. The vent tube allows atmospheric air to circulate into and out of the tank with changes in temperature, windage (running, fuel consumption, etc.) Now consider that CO2 is heavier than normal air, so does it follow; if one were to shoot some CO2 into a fuel tank and it being heavier than air, it would tend to stay in the tank cutting off the source of humidity (H20) coming in with normal air? Would the ethanol be deprived of the moisture source for absorbing it into the fuel?

A possible source of CO2 would be a CO2 fire extinguisher or an old scuba tank filled with CO2 of some other similar source. When you put the boat away for any period of time- shoot some CO2 into the tank and put some non-porous or masking tape over the vent tube opening.

Any thoughts? Just wondering.