Amanda, there is a passage in the book "How to Rebuild and Repair Farm Tractor Engines" by Spencer Yost that I think might be helpful. It sounds like a pretty easy way to do it. Here it is: "To scour the [gas] tank [of rust], put some clear water and a handful of small smooth creek pebbles or roofing nails in the tank. (Roofing nails are made of aluminum, hard enough to remove rust but not hard enough to damage the tank.) Then begin agitating the mixture, alternating sides and rinsing often, until all traces of rust are gone. This is a tedious and time-consuming process, and there are no shortcuts here. Making a tumbling apparatus that is easily turned by hand or better yet, electrically powered, will help alleviate the drudgery of this job, or you can put it on a small cart and just push it back and forth. The job is finished when the rinse water shows no appreciable sign of rust. Next follow with a solution of water and a small amount of a strong cleaner and repeat. Change the solution two or three times. This will remove any last traces of gasoline, sludge, and fuel varnish. Rinse and dry the tank completely. The exhaust of a vacuum cleaner pumped into the tank helps dry it quickly to eliminate flash rust." (page 126) I hope this helps you! Dawn
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