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Farmall & IHC Tractors Discussion Forum
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M gas tank

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Eri k H

03-09-2008 12:13:03




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My '42 M has the usual rust in the bottom of the gas tank, which is starting to get into(and block) the filter. What is the best way to fix that? I've seen different sealers on the market, or is it best to take it to a shop that with the right eqipment?




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bc

03-09-2008 20:37:19




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 Re: M gas tank in reply to Eri k H, 03-09-2008 12:13:03  
I done a couple different things besides and after acidizing the tank with muratic acid to get rid of the rust.

Tee off the bottom of the tank with the sediment bulb coming off the side of the tee with the appropriate adapters. Nipple and bullplug the bottom of the tee so the rust will drain straight down and you can clean it out of the bottom nipple every so often.

Take some window screen and roll/fold it so you have a 2" standpipe that you wrap around the short sediment bowl standpipe and tie if off with welding wire or something. Rust will catch in the folds of the screen so you need to remove it to clean occasionally and let the rust drain out.

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Patrick Martin

03-09-2008 17:35:09




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 Re: M gas tank in reply to Eri k H, 03-09-2008 12:13:03  
You can use electrolysis for this also. Use a nail or peice of rebar for the electrode and hang it by the wires into the tank and simply fill the tank to the brim with electrolyte. Be sure to set the tank on a pan or something cause goop bubbles out.

I've got one M tank I'm doing now and when I'm finished I'm going to reverse the process and attempt to re-galvanize the tank. You ought to be able to reverse the polarity and using a chunk of zinc (boat anode, water heater anode) in place of the electrode and coat the inside of the tank with zinc.
This is an experiment I'm in the middle of so I'm not sure but it should work.

If you go with a sealer then the best I've found is made by POR-15. YOU MUST FOLLOW THE DIRECTIONS TO USE IT!

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Janicholson

03-09-2008 12:32:21




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 Re: M gas tank in reply to Eri k H, 03-09-2008 12:13:03  
There are many ways. With it off, and all fittings removed, and the hole plugged, Clean sand, and a couple of pieces of chain, or 5# of bolts put in it. then strap it with ratchet ties to the top of a concrete mixer and let it spin while the material works magic inside. Then clean it out, and coat the inside with gas tank sealer. Follow the directions carefully. JimN



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GordoSD

03-09-2008 16:07:35




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 Re: M gas tank in reply to Janicholson, 03-09-2008 12:32:21  
If you got it really clean, and it's not leaking,why would you put a sealer in there? I've heard of more problems with bad sealer, or sealer coming off and plugging the system, than with rust.

Gordo



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Janicholson

03-10-2008 06:17:53




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 Re: M gas tank in reply to GordoSD, 03-09-2008 16:07:35  
The anti rust coating in the tank from the factory is compromized(or it would not have rust in it) so I recommend putting a sealer in. I have had no issues with the process. JimN



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NDS

03-09-2008 15:15:09




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 Re: M gas tank in reply to Janicholson, 03-09-2008 12:32:21  
Cleaning and sealing tank is best way but a lazy mans quick fix is to remove sediment bowl and rig 1 1/2 inch standpipe in inlet line this will keep most crap in bottom of tank out of sediment bowl.



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GordoSD

03-09-2008 16:02:17




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 Re: M gas tank in reply to NDS, 03-09-2008 15:15:09  
Wouldn't that eventually give you 1 1/2 inches of water in the bottom of the tank?

Gordo



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NDS

03-09-2008 16:14:31




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 Re: M gas tank in reply to GordoSD, 03-09-2008 16:02:17  
If it does just run tractor out of fuel , remove sediment bowl and drain tank. This was meant as a get by fix untill you have time to do it right.



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NDS

03-09-2008 15:18:35




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 Re: M gas tank in reply to NDS, 03-09-2008 15:15:09  
meant to post under Eri k H's post.



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Andrew Z

03-09-2008 12:27:58




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 Re: M gas tank in reply to Eri k H, 03-09-2008 12:13:03  
You can do this job, not hard at all just takes some time... but not hard
First clean the tank with an abrassive cleaner with a chain or rocks in the tank at the same time and shake it many times. (this will get all the rust and dirt to break free from the tank and will pour out)Do this proscess a few times till the cleaner comes out fust and debris free. I used "Red-Coat" tank seal/coating in a few of my tanks and have great success with it. Its about 20 something a can. Just follow the directions on the can for application.

Andrew

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