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Old 04-09-2011, 04:08 PM
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clean out old gas tank

what to use to clean old gas tank

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Old 04-09-2011, 05:10 PM
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An old chain and lots of shaking.
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Old 04-09-2011, 06:10 PM
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I just cleaned 2 small engine tanks using Muriatic acid....It does a good job of removing scale and rust....Only trouble I had was, when I was done I had a bunch of pin holes (rust through)...I had to coat the interior with a gas tank coating product.
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Old 05-22-2011, 10:15 PM
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I've cleaned out a few vehicle gas tanks and some NATO jerry cans with 50/50 muriatic acid/water and medium sized COARSE limestone gravel. First, I clean out the tank with some Simple Green or other degreaser and wash it out. Then slosh a few gallons of the acid/water mix and gravel and repeat and repeat.

Of course, you want to wear heavy rubber gloves, safety glasses AND a protective face shield, and away from anything you remotely care to keep clean. If you don't have coarse gravel, you can use some heavy chain, but the acid might etch/eat into it a bit.

I then wash the tank out with Acetone and let it air dry. After it's dry, I seal them up with some gas tank sealer.
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