[AT] Phosporic acid and cleaning a gas tank

[charlie hill]

Muratic acid is REALLY tough on steel.  You need to make sure you have all 
off that neutrallized to stop it from eating the metal away.    You might 
need to get some sort of tank sealer and put in that tank as soon as 
possible after you get the new accumulation of rust out.

Charlie
----- Original Message ----- 
From: "Kyle Sands" <willys_46 at mail.com>
To: <antique-johndeere at lists.antique-tractor.com>; 
<at at lists.antique-tractor.com>
Sent: Friday, July 15, 2005 11:49 PM
Subject: [AT] Phosporic acid and cleaning a gas tank


>I would never have imagined it would be so difficult to find phosphoric 
>acid.  I called all over town asking for it by name and also under names 
>such as ospho, metal prep, or metal etch.  Nobody had anything, but more 
>likely, I don't think anybody had a clue what I was aksing for...
>
> In desparation, I went to a fleet store and looked through all their 
> cleaning products to see what I could find.  I finally found a product 
> called rust destroyer or something like that and it listed the active 
> ingredient as phosphoric acid.  It cost my 8 bucks for 32 oz. but I didn't 
> care.
>
> I had cleaned out my gas tank using muriatic acid to eat away all (or at 
> least most) of the rust inside.  I then washed that solution out with a 
> lot of water and poured in this rust destroyer stuff.  I sloshed it 
> around, let it sit, sloshed it around again, let it sit, and did that 
> several times leaving it in overnight.  I poured it out the next day 
> figuring my tank was ready - sealed and protected from future rust.
>
> Wrong!  I opened it up a couple days later and rust is starting to form on 
> the walls and on the little metal dipstick.  What's going on?  I thought 
> phosphoric acid was supposed to coat the metal with a protective coating?? 
> Am I wrong, or did I mess up somewhere?????
>
> Kyle Sands <>< Alexandria, MN
>
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