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Farmall & IHC Tractors Discussion Forum
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F12 carburator

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gene oslund

09-16-2007 16:45:02




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I have a 1934 f12 with a dual fuel carb. It runs but not as pretty as i would like. No matter what I try it always seems to get too much gas. Am i just ignorant or is because it isn't a gas carb. Or do they all just run like that. Any help will be appreciated. Thanks




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John M

09-17-2007 03:52:12




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 Re: F12 carburator in reply to gene oslund, 09-16-2007 16:45:02  
After fighting with mine for several years, on and off, I just replaced the float, set it a little low, like a 32s lower and it runs like a top now.



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Bob Kerr

09-16-2007 19:32:58




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 Re: F12 carburator in reply to gene oslund, 09-16-2007 16:45:02  
Gene, try syphoning the gas in the tank to half way. Sounds like yours has the problem mine has, a leaky needle and seat in the fuel bowl. An F-12 will run with a bad fuel pump if the tank is full as it will gravity feed at that point. I have a feeling that when full and the pump working it isn"t hard for the fuel to bypass the leaky needle valve. My 35 F-12 runs like a top with the fuel no more than 2/3 full. fill it and the black smoke rolls out! If my tank is more than half full, I also have to park it pointing up hill or it will flood out over night since the fuel shut off also leaks a little. The carb is the exact same for kero or gas with the exeption of the drain cock for the kero models. The high speed mixture screw has to be leaned out slightly when running kero. I have ran mine on both fuels.

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