HEET gas additive is supposed to remove condensation from gas. It is supposed to be OK for all engines, but I've never personally tried it in a ski. To avoid condensation in the future: Fill the tank with gas before storage (winterization), and add StaBil fuel additive. Many make the mistake of emptying the fuel tank before storage, but you should do the opposite to avoid condensation.I am looking for a solution to getting water out of the gas tank. Apparently I have had some condensation in the gas tank. Are there any additives that can be added to fix this problem?