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Farmall & IHC Tractors Discussion Forum
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f-12 gas regulator

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52 G

01-03-2008 19:26:58




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First of all thanks for the info on frame twist i posted. Took bolts out on front end as suggested and two had bottomed out just as they got tight, probably causing some movement, will try tomorrow. Now i was wondering if you have to have that regulator return in the hood or can you go from fuel pump to carb without any problems as some don't have it. Thanks for any info, Ken




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Mike Wielenberg

01-04-2008 18:22:37




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 Re: f-12 gas regulator in reply to 52 G, 01-03-2008 19:26:58  
Well I have a F-12 with the fuel line vent in. And a F-14 were it has been removed. I put in a new diaphram in both fuel pumps. The f-14 I use all summer long for odd things around the yard. I have never had any problems with it blowing the diaphram in the fuel pump. So I am gonna say that it doesn't matter in my opinion. But I could be wrong. Hope it helps.
Mike



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Dave Allgire

01-04-2008 08:22:18




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 Re: f-12 gas regulator in reply to 52 G, 01-03-2008 19:26:58  
First, its not a "regulator". Its correct name is "fuel line vent". A description of its function; the fuel pump draws fuel from the gas or distillate tank. It pumps it to the fuel line vent chamber. The fuel then goes to the carburetor inlet or overflows inside the vent back through the large return to a tee at the inlet to the fuel pump. As has already been said, this fuel continues to be recirculated until the float opens up to admit more fuel to the carburetor. The plug on top of the vent chamber has a small hole drilled through the side to admit air as needed. The plug can be removed and gas added to restart after running out of distallate. (already mentioned) This vent chamber, open to the atmosphere, provides the "pressure relief" of the AC style pumps. On a gasoline model tractor only, yes, there is a tee at the top of the fuel tank that provides for the overflow of fuel not used by the carburetor. The venting is provided by the gas cap on the fuel tank.

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Bob Kerr

01-04-2008 07:28:54




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 Re: f-12 gas regulator in reply to 52 G, 01-03-2008 19:26:58  
That little "regulator" on the hood is a primer tank used on kero models. If you run out of fuel while using kero it will not start unless you get it cranked within a min or so. The manifold cools off too much to vaporize the oil. You have to use the drain cock on the carb to drain kero out of it and then he brass nut on top comes off and that is where you put a little gas in to get it restarted. There is no pressure relief on the system since the unused fuel goes back to the fuel lines before the pump. Some "may" go back into the main tank at times, but the rest just circulates through the lines until the carb uses it and the main tank replaces it. It basicly gravity feeds the carb. The lines on my 12 are all there and it works great outside of the leaky needle valve in the carb which floods engine if tank is filled full.

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Ron Weber

01-03-2008 20:19:22




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 Re: f-12 gas regulator in reply to 52 G, 01-03-2008 19:26:58  
You have to have some type of pressure relief for the AC style pumps otherwise they will either blow the diaphram and leak gas into the crank case or flood out the carb. Gas models have a T at the top of the tank to let the overflow run into the tank. Kero models have a regulator that has a much larger return line back to the pump inlet. I have learned this from experience.



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