Re-doing my gas tank

[JoeKan]

I had thought about replacing my gas tank and the reserve tank on my 72 burb. Unfortunately, LMC and other companies only offer 1 tank that holds around 20 gallons. I would like to keep the original tank and reserve which holds around 40+ gallons but I'm wanting to clean it out before I put gas in it (It hasn't been driven in several years as I have been restoring it).
Can someone recommend what I need to do to my tanks to get the rust out and anything else I need to do to my tanks?
Thanks in advance,
Joe

[JoeKan]

What about a radiator shop?
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[bguild]

Pretty sure Eastwood has some gas tank sealer with a rust/cleaner. I actually just ordered something similar from them for my harley tank i had to weld on. website is eastwood.com

[my67chevytruck]

check into a local shop and see what they charge. some shops can clean via dipping, and also dip to regalvanize the metal. if you want to do is yourself there are plenty of companies that sell a kit, just google gas tank cleaning kit. contact a company and tell them the tank capacity and see if they can help.

here is one:

http://www.kbs-coatings.com/Auto-Fue...-Kit_p_34.html