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Farmall & IHC Tractors Discussion Forum
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Super MTA Dies - Fuel???

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KeithN

12-25-2007 15:27:22




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Took my Super MTA out and it ran fine for about a mile and half. Then it started acting like it was running out of gas and finally died. It would start up right away, but would run roughly like fuel starvation and would die on letting out the clutch. By letting it sit for about five minutes, I could get it going and would run good for about 1/3 mile and then start cutting off again. I could get another 100 yards out of it by pulling out the choke. Finally got it home by this method. Tank is full and fuel bowl is clear and full. I"m new to farmall"s, but expect it"s something simple that someone could point out quickly to me???? Thanks

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JMOR

12-26-2007 21:55:16




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 Re: Super MTA Dies - Fuel??? in reply to KeithN, 12-25-2007 15:27:22  
What several of these posts say fit real well with my SMTA experience a month ago. Not in the bowl screen, not in carb inlet screen, but in the narrowest part of the tank gas valve passage...insect & vegetation parts.. not much, maybe total size of lady bug, but enough to cause exactly your problem.



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CNKS

12-25-2007 16:37:54




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 Re: Super MTA Dies - Fuel??? in reply to KeithN, 12-25-2007 15:27:22  
If not in good light, take a flashlight and poke a wire into the gas outlet inside the tank. My M did exactly the same thing, there was a piece of crud in the outlet. Once I got it broken up it ran fine, common problem in old gas tanks in little used tractors. This might save you from draining the gas, removing the sediment bowl and fittings from the tank and doing it the right way.



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dzwoodcutter

12-25-2007 16:27:54




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 Re: Super MTA Dies - Fuel??? in reply to KeithN, 12-25-2007 15:27:22  
Had a super M that acted like that. After cleaning screen at carburetor and carburetor twice I found out that there was some small pieces of chaff in bottom of gas tank. After being run for a while they would migrate to the valve above the settling bowl and restrict the fuel flow. Try removing settling bowl under tank and place can under valve. Open valve and see if you have a good flow coming out of gas tank. You might be able to check inside tank for floating debris by removing fuel cap and shining a small flashlight into tank.

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RustyFarmall

12-25-2007 16:22:45




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 Re: Super MTA Dies - Fuel??? in reply to KeithN, 12-25-2007 15:27:22  
How long has it been since it ran the last time? You definately are describing a fuel starvation issue, and if the tractor has been allowed to just sit for some time, most likely the needle valve in the carb has become stuck, or the float hinge pin has become corroded and will not allow the float to drop down and allow more fuel to come in. You will probably need to remove the carb and open it up to cure it.

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Wayne in MN

12-25-2007 16:14:09




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 Re: Super MTA Dies - Fuel??? in reply to KeithN, 12-25-2007 15:27:22  
Take the gas cap off & try running the tractor; maybe you are creating a vacuum in the tank which will stop the flow of fuel.



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stkman_tn

12-25-2007 16:03:51




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 Re: Super MTA Dies - Fuel??? in reply to KeithN, 12-25-2007 15:27:22  
Sounds like somethig is restricting your gas flow. Pull the gas line running to the carb and check flow there.



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Hoss in Maine

12-25-2007 15:38:32




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 Re: Super MTA Dies - Fuel??? in reply to KeithN, 12-25-2007 15:27:22  
Are it cold where you is at?If so try some drygas. Shivering in Maine,Hoss



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KeithN

12-25-2007 15:49:23




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 Re: Super MTA Dies - Fuel??? in reply to Hoss in Maine, 12-25-2007 15:38:32  
Nope. I'm in Austin, TX and it's a real nice day here in the mid 60's.

thanks



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El Toro

12-25-2007 16:23:25




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 Re: Super MTA Dies - Fuel??? in reply to KeithN, 12-25-2007 15:49:23  
third party image

You need to remove the gas line at the carburetor
and see if there's a full stream of gas. Hold a clean container and catch the gas. You should have a stream like after drinking about 12 beers.
If you have a good flow of gas and not just a trickle there's a screen behind that fitting where your gas line connects and it may be full of dirt or rust. If you don't have a good flow of gas your tank may have some blockage over the outlet hole in the tank. These old tanks are rusty and dirty. Make sure your main jet at the bottom of the carburetor is opened enough, that's where your engine get's it enrich fuel mixture
on some of these old tractors. These old updraft carburetors don't have accelerator pumps like cars
and trucks had back before fuel injection was used. Some had 2 barrel carburetors and some had 4 barrels. When you wanted more power you just pushed the accelerator to the floor. We had dual 4 barrel carburetors on each Ford engine on this vehicle we used for drawbar pull on military vehicles. Now it would suck up plenty of gas. Hal

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Andy Martin

12-26-2007 05:09:53




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 Re: Super MTA Dies - Fuel??? in reply to El Toro, 12-25-2007 16:23:25  
Actually, the IH updraft carburetors on H's and M's do have a form of accelerator pump. The air bleed circuit continually bleeds air into the fuel just past the main fuel jet, creating little bubbles in the fuel standpipe. When you snap the throttle open the increase of vacuum on the air cleaner side of the throttle sees suddenly increased vacuum and those little air bubbles in the standpipe explode and push the fuel in the standpipe into the air stream. A no-moving-parts accelerator pump. Just like the no-moving-parts fuel pump on the letter series.

Tractors with the air circuit (through the valve at the end of the throttle plate shaft) plugged or not adjusted right will always stumble upon sudden throttle opening but will do fine on slowly increasing throttle position.

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