Posted by bc on January 31, 2008 at 18:42:09 from (66.138.123.176):
In Reply to: cleaning fuel tank posted by dwag on January 31, 2008 at 18:13:49:
For cleaning rust and all other crud in a tank, I used a couple gallons of Muratic (hydrocloric acid) acid. Left it for a day to concentrate on the tank bottom, then filled it up with water to get the rest of the tank for another day. Then finished off the rust removal process with a gal of phorphoric acid for a while in the bottom and then diluted it with water to soak for another day. Final thing I was told and did was spray the inside of the tank all over with wd40 to help prevent future rusting until you start using it. I did all this with the tank on the tractor. It left my tank pristine and there had to have been some varnish in there but certain acids work or some things and not on others. My wife said the Muratic acid would eat the bottom of the tank out if I left it in there overnight but it didn't.
Now just for varnish and gum only, I would consider some type of varnish remover. There are certain chemicals that work very good for one purpose such as paint thinner, acetone, etc. I forget without going to the store and studying the labels. Maybe spraying a can or two of carb cleaner in the bottom of the tank may do it. That is how I clean most things and I buy the cheap walmart stuff.
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