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Clean Your Gas Tank Out on a budget

How about using my fail safe method for doing gas tanks?

I remove the tank and rinse out with soap & water (Dawn or Mr. Clean works good). If there are any large holes you can repair them now by soldering or welding patches without blowing yourself up.

Next remove the float & sender unit, plug all openings good with cork or rubber plugs and duct tape, stand tank up on end with the filler neck straight up, fill with 1 gallon of Muriatic Acid and top off the tank with cold water from a hose. Let it sit for a couple of days, topping the water to cover for evaporation Wherever the water line is will be some surface rust when you are done....easy to take it off up at the filler neck opening.

Really bad tanks will need 2 gallons of acid. After the days pass, you can look in with a flashlight & see that the metal should look like brand new. Now have these chemicals ready when you dump the water so you can treat the tank right away.

Baking soda (Neutralize the acid in the tank)
Isopropyl rubbing alcohol
MEK (methyl ethyl ketone)
Bill Hirsch's alcohol-proof sealer or Equal

Dump the water from the tank, dump in a box of baking soda and refill with the hose to stop the acid's reaction. After a little while, dump the tank and flush with the hose. Then empty it, pour in 2 or 3 cheap bottles of isopropyl rubbing alcohol to soak up the water, slosh it all around and dump. Then pour in a quart of MEK (methyl ethyl ketone), slosh this around in all the nooks and crannies, and dump it out. Lastly, pour in some MEK-based gas tank sealer (I use Bill Hirsch's alcohol-proof sealer) and slosh the tank. Any little bit of MEK from the last step will mix perfectly with the sealer (unlike lacquer thinner). Pour the excess back into the container so you can repeat the sealer sloshing after the first coat dries.  Maybe do the coating a couple of times, and a third coat on the bottom.  That's where the water lays.

Let it dry out real good and install. 

Works every time!

Another option is a brand new tank from Spectra Click on their e-catalog at the top of the home page.
 

Thanks Bob!