Farmall 560 gas tractor carb problem?

I have Farmall 560 gas tractor: it keeps stalling after running for a few minutes in most gears, but it stays running in first gear with the choke pulled all the way out. It used to only needed to be choked to start; now it needs the choke all the way out just to stay running in first gear. Is this most likely a carb issue? Owned tractor for two years and have never done any carb maintenance on it.
 
(quoted from post at 07:17:38 06/05/15) I have Farmall 560 gas tractor: it keeps stalling after running for a few minutes in most gears, but it stays running in first gear with the choke pulled all the way out. It used to only needed to be choked to start; now it needs the choke all the way out just to stay running in first gear. Is this most likely a carb issue? Owned tractor for two years and have never done any carb maintenance on it.

First thing you need to do is clean the sediment bowl, located under the gas tank. If that doesn't cure it, remove the fuel line from the carburetor, and then remove the fuel inlet screen from the carburetor. That fine mesh screen is probably full of crud. A can of aerosol carb cleaner will clean it up good. If that doesn't fix it, the problem lies deeper in the carb.
 
Sounds like a fuel problem but not necessarily the carb. I've had trouble on a couple of mine with stuff in the tank plugging the outlet and stuff growing in the screen to the carb despite having a screen in the sediment bowl. Its also possible you have a leak on the intake part of the manifold. I would start with pulling the plug in the carb and see what kind of stream runs for a minute or two. If it runs a good stream and no junk then at least you have enough fuel to the carb. I'm having a similar problem on a tractor of mine and I am seeing a lot of crap coming out of the fuel line if I disconnect it from the carb.
 
Thanks, i cleaned sediment bowl and screen yesterday. I will proceed to take off fuel line going to carb after i get
home from work at five. Please check back with me later, thanks again.
 
Alright, so now i have disconnected the fuel ine leading to the carb and have removed and inspected the metal screen
that came out. The screen was clean, next step i am going to take is draining the carb, does anyone know if the drain
plug for it is on the bottom or the right side of the carb??? Please and thank you!
 
Did you open the fuel shutoff and run through the disconnected line into a can? If the screen is clean it may be a blockage in the tank.
 
I shut sediment bowl before disconnecting fuel line from carb. Should i open it to see if gas flows feeely from fuel line? I will try that...
 
I opened sediment bowl to disconnected fuel line and there was a steady stream of clean gas coming out. So i would
conclude that gas is getting to the carb fine.
 
(quoted from post at 16:21:38 06/05/15) I opened sediment bowl to disconnected fuel line and there was a steady stream of clean gas coming out. So i would
conclude that gas is getting to the carb fine.

I have seen folks struggle with these issues for weeks testing and replacing electrical parts, points, plugs, caps, condenser coils. One of the problems is you cant see what's going on inside the carb bowl. But the fact is you can. If you suspect the carb a very simple test may save you some money and more importantly time. I'm no expert but this worked well to isolate my problem.

There's a few things you can do when you have a tractor that runs then stops If you think its the carb. You can try to pull the choke out you have already done that when it starts to die. That would tell me its a carb or vacuum problem. The other thing is a little unorthodox but works well when you have a tractor that starts but wont continue to run. As you know liquid finds its own level pull your drain plug on the carb and rig a {fitting the best thing} or just wedge A clear tube in the bowl drain so it don't leak hold it up or tape it to the carb or along side the carb you will now have a visual aid and be able to see the level of fuel in the bowl If there is any and what happens after you start the tractor. This is similar to a water level made from a coffee can. There much more accurate than most rotating laser levels
Note: The tube can create a suction when you drive it if the air stream is great enough across the top and particularly if the end is cut at a 45 degree angle, less the tube is tucked in out of the air stream. The beauty of it is It don't matter how long a tube you have you can tuck in under the hood if you like. The fuel level in the bowl and the level in the tube should remain the same what you don't want to do is plug the end of the tube. Go back to before the PCV valve was invented in 61, blowby vapors were simply vented to the atmosphere through a road draft tube cut at about a 45 degree angle this ran from a vent hole in a valve cover and down into the air stream under the car this system worked well but the drawback was oil was also drawn through the tube and ended up on the road. I drove my tractor around in 3rd gear and the tube taped to the carb and wired up to the manifold. Honestly Its just a visual aid that allows you to see what's going on with the fuel level inside your carb, I can say its not as helpful when you drive around because the fuel sloshes around in the clear tube but as you start to notice you have a problem you can stop and see what is going on inside the carb bowl, but best to let it just set still and test it. IS it possible for it to tell you if your gravity feed tank is pressuring or if the manifold is sharing gases MAYBE I don't know I never had had that problem and never tested it for that. If the level of gas in the tube is higher than the bowl I would suspect something along those lines. Will it tell you if your not maintaining enough fuel in the bowl or enough suction to draw it into the engine that I can tell you, yes without a doubt. You will have no fuel in the tube or very little that was my problem clean or rebuild. If you still have the same fuel level in the bowl when it dies suspect plugged holes inside the carb, Manifold vacuum leak or crack ,leak around the carb itself or mount sometimes you may find loose bolts that hold the top and bottom of the carb together. Or it may not be the carb try to throttle it up and down . Spraying around these areas with starter fluid WHEN its cool can help eliminate these as an issue some have suggested propane torch or ether. Either way you need to rebuild or at least clean all the passages in the carb if you cant pin point any other leaks or issues. I tried to cover all the bases. I cleaned the tank sediment bowl lines and finally rebuilt the carb. But the most important thing that I got out of it was it did tell me that it was not an electrical or a mechanical problem it was simply was not getting gas. This can be very helpful.
Best of luck Byron
 
Sounds like the inlet to the sediment bowl is partially restricted. Might be some scale, rust or some other debris in either the shutoff valve or the inlet itself. It might not show up if sitting still and a seemingly normal flow is there, but under higher demand it starves out. Sometimes blowing back through the fuel line will clear it up for a bit. I'd also look at the carb. fuel inlet screen.
 

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