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Old 09-27-2010, 08:48 PM   #1
Jason_Canuck
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Rust in Gas Tank

Bought another bike this past weekend, that had been sitting for a year, unprepped for storage. Tank had plenty of varnish (down around fuel pump) and rust (up near filler neck). Used some BBs, carb clean and vinegar and have removed the varnish and almost all of the larger flakes of rust. But areas remain with very slighty rust film. Has anyone here ever used phosphoric acid solutions to convert the iron oxide to iron phosphate? And if so, any issues with the iron phosphate breaking down?
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Old 09-27-2010, 08:57 PM   #2
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I would replace the tank if it isnt too expensive. Sometimes trying to unrust a tank ends up being more trouble than its worth.
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Old 09-27-2010, 09:16 PM   #3
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This is pretty much a stop gap measure until I can find a reasonably priced used tank.
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Old 09-27-2010, 09:37 PM   #4
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Search the net... I saw a way to use a battery to unplate the rust from the tank.
I know it sounds crazy but I swear. You can remove the rust with a battery and a metal rod.
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Old 09-27-2010, 09:43 PM   #5
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Problem with electrolysis, is lack of space inside gas tank to hang sacraficial metal rod.

Believe you me, I've been searching all night for different methods. Best one out there yet, is 1 part molasses and 3 parts water to chelate iron oxide.
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Old 09-28-2010, 09:15 AM   #6
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Found a chelation agent, Evapo-rust, that I am going to try anymore acid treatment.
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Old 09-28-2010, 09:35 AM   #7
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Found a chelation agent, Evapo-rust, that I am going to try anymore acid treatment.
sweet, post up how it went....
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Old 09-28-2010, 09:37 AM   #8
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I've used the evaporust, its like 17.99 at Harbor Frieght, I had limited results, but was dealing with 4 years of rust from a half full tank.
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Old 09-28-2010, 09:51 AM   #9
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I've just got a film in bottom of tank, so i am hoping it will work. How long did you let it soak for?
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Old 09-28-2010, 10:23 AM   #10
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About 3 hours
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Old 09-28-2010, 11:49 AM   #11
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yea, it's called Naval Jelly

works just fine
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Old 09-28-2010, 01:35 PM   #12
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Naval Jelly is phosphoric acid based, not a chelant.
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Old 09-28-2010, 02:58 PM   #13
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thought your question was "Has anyone here ever used phosphoric acid solutions to convert the iron "
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Old 09-28-2010, 03:05 PM   #14
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Sorry, changed pathforward half way through thread. I apologize.
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Old 09-28-2010, 03:35 PM   #15
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none needed man, were all cool
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Old 09-28-2010, 06:48 PM   #16
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Quote:
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This is pretty much a stop gap measure until I can find a reasonably priced used tank.
sheeeeeit, just rinse it good with phospho, for a minute, not very long, then rinse thoroughly with water and then when empty toss in some rubbing alcohol and swish it around, it displaces moisture, then dry and install and put a filter on it before carbs and have fun.
I have a tank from 1981 on mine and its happy.
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Old 09-28-2010, 08:40 PM   #17
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Crappy cell phone pic.

downsize

OSPHO is likely going to be used for filler neck.
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Old 09-28-2010, 09:28 PM   #18
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I wouldn't even bother with it
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Old 10-02-2010, 08:03 PM   #19
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Just a quick update. So I broke down and bought a gallon of Evapo-rust and after 2.5 hours the tank looks almost like new on the inside. Pretty much just let it soak and then agitate before changing position. Rinsed with water, then alcohol and then WD40, filled her with fuel and up and running. I'll try and get a pic up tomorrow to show the result.
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Old 10-03-2010, 12:50 PM   #20
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The end result.


downsize 1]
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