gas tank rust removal

I have a small tank its for a bike but I thought on this site this was checked out more so the question what is the best way and cheapest to remove rust from the inside of a gas tank not heavy rust just a little
 
Add a cup of paint thinner and a foot of chain, seal it up. Bungie cord it to the rear wheel of your tractor and go for a ride. 30 minutes should do it. Dump out the dirty thinner and chain, should be clean as a whistle.
 
I've had good results with muriatic acid. Slosh some around in there and you wind up with bright metal inside. Rinse well! Never had much luck with the "strap it to the wheel" method, and it's a pain with large tractor tanks.
 
I vote Muriatic acid. Has worked wonders for me. Except the tank will be susceptible to moisture and rust more easily they say. I have never had an issue.
 

I have done several tanks of all types by boiling it out .It will remove the gunk build-up inside too . I use a fish cooker out in the yard . Put in some detergent ( any kind ) , fill with water , fire up the fish cooker and let it come to a boil . How long you let it boil depends on how much gunk is in it . After it has boiled a while , let it cool , dump water / soap out and rinse with water . Arter drying it should be ready . No acid or other residue to contend with . As stated before , i have used this method on cars , trucks , lawn mowers , motorcycles etc.
 
I have had good success with one of those gas tank sealer kits. The Eastwood company sells one for small tanks (up to 12 gallons) for $29.99. I used one on a tank from an old Delco Light plant engine tank that I dumped about a cup of rust out to start with. It didn't have any holes, so just used the kit. It came out real nice. It is a three part system: rust remover, metal wash, and sealer. It is especially easy on a small tank like a bike tank.
 

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