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#1
03-02-2021, 08:47 AM
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Ideas for a rusty tank
I've got a couple of gas tanks, all of which have varying degrees of surface rust inside.
Any (good) ideas to deal with it? I've heard of putting some small metal objects (nuts, etc) inside and agitating to clean the rust off, but then what? Hard to get a tank to last 60 years these days without showing signs of wear 
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61 and 63 Originals 123 (2) 782D 106, 147, 122 102 parts It's only original ONCE!
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#2
03-02-2021, 09:17 AM
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There are baffles inside the tank that will not allow abrasives items to get to that area.
Best to research chemical de-rusting solutions such as muratic acid. Just be sure to follow label directions as well as precautions. Worked for me on my tanks. Did several at a time so I could reuse the solution.
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#3
03-02-2021, 09:58 AM
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I'm going to ASSUME you are working on small engines not a motor vehicle tank.
If so, they have no Baffles, so throw in a handful of rocks, nuts or what have you and shake the shit out of it. It helps if you put some vinegar in them a day or two earlier. as it loosens/dissolves some of the light rust. Depending what you have for contamination, other products might prove better if you have say varnish or similar. Do take out any screen that might be in the outlet and put in a plug so the liquid will stay inside during the agitation process. When finished, wash out with soap/ water and dry in the sun. Rust in a tank that doesn't flake off, poses no problem, as it hurts nothing. 
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#4
03-02-2021, 10:23 AM
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Thank you gentlemen.
Yes, sorry this is in a couple of Kohler tanks that I'm going to do, so baffle-less. I ordered some tank coat elixir and will use that after some mech/chem rust removal. Darned alcohol/water in gas these days ...grrhhhh. I appreciate the advice!
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61 and 63 Originals 123 (2) 782D 106, 147, 122 102 parts It's only original ONCE!
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#5
03-02-2021, 10:45 AM
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I have had pretty good luck using straight vinegar or maybe some Acetone.
Let it sit for a couple days shaking it up whenever I think about it. Lots of soap and water after that. Ken
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#6
03-02-2021, 10:49 AM
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Look up Evapo-rust. I never used it on a gas tank, but I have used it on other things and it works good. It is non toxic, and reusable. I was planning on using it on the tank for my 149, but then I found a nice rust free one.
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125, 126, 147, 129, 149 x 2, 1450, 882, 1810, 1320, 1440, 2135, 2 129’s for parts/project, 1950 Farmall Cub 38" LT mower deck, 4 42" triangle mower decks, 2 44A mower decks, 2 50C mower decks, 42” GT deck, 3 42" snow/dirt blades, 42" landscape rake, #4 cart      
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#7
03-02-2021, 02:37 PM
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Do as you like, I have no respect for a "cream" of sorts in a tank.
Maybe because I'm the one that is handed a mess that someone did a while back and it went all bad and am asked to "fixit up" because it rusted between the "coating" and tank or the coating is rattling around inside loose, like a pocket full of marbles. No offence, just my experience. Or like JB weld to stop a leak around a fitting. Just fix it right by sweat soldering the hole or bung in the first place. Luck!
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