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Farmall & IHC Tractors Discussion Forum
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Farmall gas caps

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John S-B

04-30-2007 18:37:17




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I have one of those replacement gas caps on my M. I sloshes fuel out unless I'm on a smooth surface. Do they commonly do that or is something wrong with the gas cap? I usally get a wet spot on the hood about a foot in diameter, it's not dripping off the side or anything.




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chadd

05-01-2007 09:29:55




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 Re: Farmall gas caps in reply to John S-B, 04-30-2007 18:37:17  
It is more than likely the filler neck on the tank. Our W-6's has a real groove worn in it from opening and closing the cap for 50 years. When gas was following the weld around the tank and back behind the electrical box when the tank was half full, I became more than a little concerned. I took the tank off, ran it over to the dealer, and the head mechanic used the tool and fixed it for no charge. It was a really simple device. There was a circular plate on the top with a hole in the center, and then a second part that went in the tank and had protrusions that stuck up inside of the hollow area between the cap stops and the outside of the neck (kind of like a 3 jaw puller with the arms reversed, but of fixed diameter and with longer hooks on it). It had a threaded bolt in its center and was held to the top piece with string. When the nut on the bolt was tightened against the plate, it would "press" the sealing surface flat. Even afterwards, though, ours leaked. I put two rubber o-rings in (one new and one old) and that fixed it, as the old one was worn down quite a bit, but it still seeped with just the new one.

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RustyFarmall

05-01-2007 05:34:05




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 Re: Farmall gas caps in reply to John S-B, 04-30-2007 18:37:17  
You might have a problem with the lip on the tank opening, and therefore the new cap is not sealing down tight. There is a tool that is used to re-shape the lip and make it just like new, but I don't know where to get it.



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Owen Aaland

05-01-2007 08:00:00




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 Re: Farmall gas caps in reply to RustyFarmall, 05-01-2007 05:34:05  
When the fuel cap replacement program was introduced in the late 70s or early 80s, all of the IH dealers were shipped a tool to repair the cap sealing area. If you have a dealer that was in business at that time, they should have the tool.



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JayWalt

04-30-2007 21:00:08




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 Re: Farmall gas caps in reply to John S-B, 04-30-2007 18:37:17  
once again george is on the money. If there is no ding in the filler neck and the gasket is good, either get a replacement cap or dont fill it quite so full (I know thats not what you wanna hear, but I would run it like that til I got it figured out).



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georgeky

04-30-2007 18:40:15




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 Re: Farmall gas caps in reply to John S-B, 04-30-2007 18:37:17  
You may have a bad gasket. There could also be a small dent or ding on the rim of the filler neck keeping it from sealing.



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