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Question about fuel tank sealant

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Mike CA

08-11-2007 09:57:53




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(First of all, I'm about a week away from being able to pick up this H.)

The previous owner put a sealant in the fuel tank to prevent rust. Some of the sealant leaked into the fuel opening and clogged the tank. That's why, he claims, the tractor stopped running. He bought a NOS tank, but it's unpainted. So, before I switch them, I'd like to try to get the nicely painted tank to work.

Has anyone used sealant (I don't know what kind) and my have some advice for recovering this tank? (Materials, techniques, steps to take, etc.)

Thanks

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Bob Kerr

08-11-2007 07:16:03




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 Re: Question about fuel tank sealant in reply to Mike CA, 08-11-2007 09:57:53  
Hi Mike, Congrats on your new H!, On the sealer thing here are a couple things I can help with. First off, the sealer may have failed because of the switch to the MTBE Oxegenated fuel started in California back in the late 90s. There were a lot of problems with older vehicles with fuel pumps, rubber hoses, possibly with sealers also. Some older sealers will disolve in alcohol also. I had trouble with a purple sealer supposedly used in aircraft on my 10-20, I will avoid using sealers ever again. If it were mine I would get the old sealer cleaned out totally and use those glass marbles the ladies use in flower vases or clean washed gravel and a gallon of water to clean out any loose rust in the tank. Shake it for as long as you can stand it, clean out the marbles and tip the tank up with one corner down and syphon off the sediment. I have done that now on two old cars I have and no problems since. I use a bottle of HEAT to get all the water out after cleaning. If you find any pits in the tank that leak, use the NOS one as it will leak again even with sealer in it. Just be sure to keep water out of the tank. If it sits outside, the vented gas caps have holes on top and will let water in, cover them if it rains. Good luck with it and hope to hear how it goes., Bob

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D Slater

08-11-2007 12:20:15




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 Re: Question about fuel tank sealant in reply to Mike CA, 08-11-2007 09:57:53  
Mike if you get the old tank clean enough to remove old sealant and clean enough to reinstall sealant, the paint will probably get messed up or completly removed anyway. As poster below stated, proper prepairing for sealant is very important and its very hard to accomplish in those baffled tanks. Had one done for a M at a profession shop once and sealant started getting in fuel, didn't have to much of a problem while running but could shut tractor off and go to start the next day and a valve or two would be stuck. After a bunch of broken push rods and freeing valves ever time I used tractor, I put another tank on tractor. Some have good luck with sealer but if you have a good tank I would use it. Out of curiousity about the NOS tank, some late IH replacement tanks had two fuel openings in bottom. One for use on H and stage 1 SH and other for use on stage 2 SH. Is your NOS tank 2 openings or one?

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Mike CA

08-11-2007 12:45:20




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 Re: Question about fuel tank sealant in reply to D Slater, 08-11-2007 12:20:15  
I haven"t seen the tank yet, so I don"t know. But I"ll hopefully think to look when I compare the two tanks.



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edss!

08-11-2007 11:37:05




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 Re: Question about fuel tank sealant in reply to Mike CA, 08-11-2007 09:57:53  
I restored an old Harley a few years ago and I remember reading that if the tank wasn't properly prepped and acid washed before applying the sealant Kream it could come off in sheets and clog the fuel line and filter. The tanks I was working with had a baffle,three oil lines and a fuel line to deal with . If your sealant is comeing off I would contact a sealant co and find out what needs to be done to reseal the tank.

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edss!

08-11-2007 11:57:47




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 Re: Question about fuel tank sealant in reply to edss!, 08-11-2007 11:37:05  
If I were you at this point I would take off the tank dump the fuel and make sure the fuel fitting is open.Clean out the tank and Put it back on with the fuel filter in place and see if that takes care of it. If it's more than that I would go with the NOS tank because it is recomended to not paint the tank till after you apply the sealant because any spillage can mess up your current paint. In other words if you reseal your current tank you may have to repaint it anyway.

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georgeky

08-11-2007 10:32:55




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 Re: Question about fuel tank sealant in reply to Mike CA, 08-11-2007 09:57:53  
Mike, I haven't tried any of the sealers, but like Gene say's I don't see why it couldn't be trimmed up and fixed to work just fine. A buddy of mine runs a Harley repair shop and he uses it all the time in those motorcycle tanks and swears by it.



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Mike CA

08-11-2007 10:59:41




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 Re: Question about fuel tank sealant in reply to georgeky, 08-11-2007 10:32:55  

georgeky said: (quoted from post at 10:32:55 08/11/07) Mike, I haven't tried any of the sealers, but like Gene say's I don't see why it couldn't be trimmed up and fixed to work just fine. A buddy of mine runs a Harley repair shop and he uses it all the time in those motorcycle tanks and swears by it.


My neighbor behind me works on custom bikes. I'll ask him when the time comes if his shop can help me out.

Thanks!

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gene bender

08-11-2007 10:26:46




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 Re: Question about fuel tank sealant in reply to Mike CA, 08-11-2007 09:57:53  
Thats why you should have a pipe plug in the threads. Just cut out the sealer with a knife and chase the threads with a pipe tab and you should be ready to go. I havent had any problems with the sealer.



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Patrick Martin

08-11-2007 11:57:24




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 Re: Question about fuel tank sealant in reply to gene bender, 08-11-2007 10:26:46  
You should try to just drill it out. I assume it has a sediment bowl underneath correct? If so a good sharp bit should work.

JFYI some solvents and acids will remove the sealer. If you choose to remove the existing sealer and go with a new one then check into the stuff that POR-15 makes. I use it all of the time and it seals hard as a rock.



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