MikeyFIN
Competitor
Leaving ethanol laced fuel in your tanks all winter will definately leave you with lots of liquid garbage come next summer. They fuel with suffer severe degradation, water absorbtion and phase seperation( the alcohol seperates from the gasoline and mixes with the water ) in about 90 days with a relative humidity of 70 percent, never mind 6 months.
Pump the tanks dry.( recommended by most major marine manufacturers including Mercury ) Leave the gas caps open to aid in the fight against condensation. In spring, pump a couple gallons of new gas in and then back out to flush the bottom of the tank(s). Then, fill em with fresh fuel and add some fuel treatment like startron to absorb any condensate water.
Now I have to ask how crappy fuels you got overthere ????
No need to answer, I have a picture of it...
If you lessen the air in the tanks the risk of it going south gotta be less than leaving it open, the gas cap is not nearly as sufficient in venting condensation out than providing it.
Try snorkel diving with a 2+ foot snorkel...
And pump the fuel out with something else than an Electrically driven pump I hope.
Leaving the gas caps open and empty the tanks so they are full of vapor with an access, plus electricity around, not allowed here.
All you need to ignite everything is to switch any electrical thing on, ANY.
In worst case static will even succeed in igniting.
I wouldn´t personally want to be anywhere near despite what Merc Says and no boat or car will be stored inside any building like that that I have a say in.
And I thought a Molotov Cocktail would be effective but guess I learn new things everyday...