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Author Topic:   Condensation on hull
mjd65 posted 01-23-2002 05:24 PM ET (US)   Profile for mjd65   Send Email to mjd65  
Tempeture is 50 degrees today. The boat is stored in a unheated garage and there are several areas with cendensation above and below water line.
Is this a problem?
lhg posted 01-23-2002 06:37 PM ET (US)     Profile for lhg    
No, except for a "not-full" aluminum built-in gas tank. This is exactly the kind of weather (cold boat, sudden warm humid weather) that puts condensation water into your tank, which gets in through the vent line. This condensation then drips into your fuel, combines with the alcohol in the fuel, and corrodes your tank from the inside out.

For this reason, and this type of weather, BW & the NMMA recommends your tank be kept full during periods of winter storage. That way, no moisture laden air can get in.

Dick posted 01-23-2002 08:49 PM ET (US)     Profile for Dick  Send Email to Dick     
With the quality of fuel we now get and as fast as it deteriorates the best way to prevent condensation in the tank is to close the vent, or with a built in tank tape the vent closed. Do not fill the tank. If the vent is closed or taped over no moisture can get in and in the spring you don't have a tank full of crappy fuel.
triblet posted 01-24-2002 12:15 AM ET (US)     Profile for triblet  Send Email to triblet     
I don't think the material the tank is
made of is relevant.

If you keep the tank full, it won't be
crappy fuel in the spring because the amount
of moisture that gets in is proportional to
the air volume in tank. No air, no moisture.
If you do truely seal it, a big high
pressure day could collapse it. If you can't
truely seal it, don't bother.


lhg posted 01-24-2002 01:12 PM ET (US)     Profile for lhg    
I have filled the tank of my winter stored 18 Outrage for 15 years now, and the engines have always run fine on first start-up in the Spring. I do add the MDR Water-Zorb before storage, which emulsifies any water and stabilizes the fuel, and does not contain alcohol. Then, as soon as the tank is half used up, I fill it up again with fresh gas.

I can't imagine sealing off the vent in a partially full built-in tank. Wouldn't this put one in the bomb making business, as fuel naturally vaporizes and builds up pressure in the tank? What about temperature changes that increase this likelihood? I don't even close the vent on a tempo plastic tank unless it is totally full. Maybe this works, as Dick has indicated, but I'd be afraid to try it. I have seen how the Plastic tanks can puff up like a balloon. So internal pressure is definitely being created, and by a much smaller volume of fuel than a built-in tank would contain.

Internal bottom corner corrosion from water/alcohol phase separation is only a problem in aluminum tanks. But this mixture is highly corrosive to aluminum and is 95% of the reason for aluminum tank failures.

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