Having it out helps. With my 2606, the tank has a baffle in the middle so chain don't help much.
Phosphoric acid works the best on getting rid of rust and keeping it from flash rusting when done as it leaves the metal with rust resistant finish. I check the EPA listed concentrations of products containing phosphoric acid and Behr concrete and masonry etcher which is in a gray plastic gallon jug at Home cheapo has the highest concentration and best price at about $15 a gallon. For heavy duty rust, I'd pour in a gallon of Muratic acid to initially clean it up and then switch to the phospheric acid. You may want to scrape some with a wire or pour some nuts and bolts in with it to shake around.
Pour a half gallon or whatever it takes to cover the bottom. Then when the rust dissolves, lay it on its sides until it is clean.
When all clean and done, liberally spray the metal with a dessicant such as wd-40 to coat the metal some more to help avoid flash rusting.
Or spend the bucks to plastic coat the thing. If the metal tank lasted 50 years like it is, you should be good to go for a while.
The trick is to have a screen or rubber hose sticking up into the tank an inch or so on your sediment bowl or pipe bushing so as any new rust collects, the screen or hose will stop it. Need a gas resistant hose. I used a rolled up piece of nylon window screen where I just use pipe fittings coming out the bottom.
Then keep the tank full of gas in the winter so water can't condense on the tank and create rust.
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