Thread: Tank Cleaning
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  #6   IP: 24.224.195.189
Old 01-06-2019, 04:25 PM
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What happens is that after a long period of time gas will leave a coating of varnish on the tank. Sometimes boats were left for months with half a tank etc and with mooring wave action the gas would splash around, then dry on the tank sides. After a while a slight coating develops. OK, if we had not started using ethanol gas it might never be a problem, however, once ethanol came into the picture it is a problem. Ethanol eats through this layer of "varnish" and it starts sloughing off. Then it ends up in filters and fuel lines. I have a 30 and all I can offer is to add some acetone or varsol to the tank and leave it a day...then pump it out. Then add some gas...rock the boat allot, and pump that out. You would get most of it but it will also be on the lines as well...so you might be doing frequent filter changes and carb cleanings.

Best of Luck.
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