[AT] Phosporic acid and cleaning a gas tank

[Rick Weaver]

Kyle,

I recommend a product called POR-15 that is a sealer marketed for just what
you're wanting to do.  I have a gas tank sealer kit waiting on me to find
time to tinker with it.

Do a Google search for it and see what you think.

Rick Weaver
Memphis, TN

-----Original Message-----
From: at-bounces at lists.antique-tractor.com
[mailto:at-bounces at lists.antique-tractor.com] On Behalf Of Kyle Sands
Sent: Friday, July 15, 2005 10:50 PM
To: antique-johndeere at lists.antique-tractor.com;
at at lists.antique-tractor.com
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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