Farmall c

[Old weldor]

I recently got my Farmall C running again after sitting for about ten years. I removed the gas tank and had it steamed out as a little bit of old gas had dried up in it and turned to a grey putty like substance. I replaced the sediment bowl assembly with a new one from case IH, also the fuel line. Had the carb cleaned and rebuilt by a very good mechanic. The problem is it starts and runs great but if you run it at three fourth to full throttle it will only run about three minutes and then dies out, if you pull the choke on it will run about another minute. After sitting a minute or so it starts right up and will do the same thing all over again. I suspect the sediment bowl assembly I purchased is faulty because it will not shut the gas off completely and only turns about one and a half turns from fully closed to fully open. Should I be able to check this by opening the drain on the bottom of the carb and checking the gas flow? How much gas should run out in how much time? Sorry about the long post but I wanted to explain the problem completely!

 

[redforlife]

Reproduction crap is not of the same quality as original factory stuff. Especially if from China. Thats why your better off not replacing anything more than you have to. I would of cleaned up and re-used the fuel shut off valve and sediment bowl. Not sure why everyone goes nutso on old dirty gas tanks, lines, and related parts. If they work, don't replace. The sediment bowl will catch anything that won't go through carb jets. An in line fuel filter added is anither mistake people make. It is not needed.
As for fuel flow, it should run out bottom of carb as fast as it can run through float needle valve. Probly some where around a cup full in a minute or less. I'm guessing there should be a screen where the fuel line screws into the carb. Sometimes people take these out and throw en away. If yours have one, it might be a problem your overlooking.

 

[used red MN]

There is another possibility, I have not been around a C that much but I assume the fuel tanks on them have a baffle that covers the back half of the tank like an H and M. Even though you had it steam cleaned the steam cleaner stream could not get behind that baffle. So now the crud that was left in there is coming free. Use a good flashlight and look in the bottom of the tank around where the sediment bowl screws in. If you see crud around there it is a good possibility that it may be plugging the hole in the sediment bowl. If this is possibly your problem your best investment will be one of these screens that goes in the top of the sediment bowl, see link.
YT fuel tank outlet screen

 

[Farmall Bob]

My shut-off turns about 10 turns, maybe your shut-off doesn't turn enough to open up all the way so you are not getting enough fuel?

 

[Old weldor]

There is no dirt showing up in the sediment bowl or screen in the carb, the sediment bowl assembly was purchased from a case IH dealer and said made in USA on the box. At least its not from China. I would still like to know how much gas should run out the carb drain in a minute?

 

[used red MN]

Somewhere between a half and 3/4 cup a minute will supply the 2 gal an hour a C claims to burn at full load. A 1/2 cup a minute is 1.875 gal per hour. Okay nothing shows up in the sediment bowl, that does not tell you there is not one lone piece of something that has came loose and gotten lodged in the opening. That is why I suggested you look in the tank with a good flashlight!

 

[Loren in Iowa]

Is there a chance the your gas cap vent is plugged?

 

[Lucid]

If your gas flow is slow, then take a coat hanger and run it up through the bottom of sediment bowl pipe. Carefully of course!

 

[Rick Remmert]

Yes, they do have a baffle. It goes across about the front 3rd of the gas tank. It is really hard to clean out from behind them. Like they said, look in the tank with a flash light at the strainer that the bowl screws into.

 

[kshansen]

(quoted from post at 18:34:42 10/07/21) Yes, they do have a baffle. It goes across about the front 3rd of the gas tank. It is really hard to clean out from behind them. Like they said, look in the tank with a flash light at the strainer that the bowl screws into.

Had a similar type of problem with my BN. Would run just fine for a while then act like running out of fuel. Now I knew the tank was clean and had been sealed due to a pinhole leak near a mounting bracket.

What I found was some small bits of the sealant from behind the baffle had come loose. Little teardrop pieces and they would sometimes cover the inlet to the sentiment bowl and other times the smaller ones would actually get down inside the valve and restrict the fuel.

After draining tank and removing the sentiment bowl assembly twice decided it was time to fix it for good. I removed the sentiment bowl once more and this time found a small piece of very fine screen, forget what it came from but was I believe part of a chain saw carburetor. I formed it into a little cup shape that fit tight over the unthreaded section of the inlet for the sentiment bowl. Then using good epoxy I attached it to the inlet. After letting harden for a few days reinstalled the sentiment bowl and installed it in tank. Have several tanks of gas through it the rest of the year and not once has it acted up again!

 

[504]

If the carb and sediment bowl were plugged I would look at the steel fuel line.The easiest way I have found to clean them is an old throttle cable from a lawn mower,or my favorite because I work in a welding supply store is an old liner from a Mig welder. Just use it like a sewer snake.

 

[Russ from MN]

First I would check to make sure the gas cap is venting. Then I think the fuel tank outlet screen is a great idea, if I ever have a problem like yours I will install one in our C. With one of those you could have a half inch of crap in the bottom of the tank and never know it, and it wouldn't matter.

 

[710ltd2002]

Tank isnt venting. Thats why it works after sitting a few minutes. Sediment doesnt go away and then come back like that. Search up IHs website and see if you qualify for a free replacement gas cap. I didnt want to replace mine, but after a day of running in the sun, a big cloud of gas blew out the top when I opened the gas tank. That changed my mind. Some Cs had a gas gauge built into the cap, and its kind of a shame to lose that feature. Good luckpost a follow up when you solve it!

 

[kshansen]

(quoted from post at 10:24:37 10/08/21) Tank isnt venting. Thats why it works after sitting a few minutes. Sediment doesnt go away and then come back like that.

Well with the flecks I had causing my problem it did come and go. I would think I was running out of fuel and limp back to garage to add fuel to find I still had 3-4 inches of fuel. go back to mowing and finish up with no problems. Other times it would just stay dead till it set for a few minutes.

 

[gene bender]

that is typical when the inlet on the sediment bowl gets plugged

 

[Old weldor]

There is no dirt showing up in the sediment bowl or screen in the carb, the sediment bowl assembly was purchased from a case IH dealer and said made in USA on the box. At least its not from China. I would still like to know how much gas should run out the carb drain in a minute?

 

[old]

Gas out of the carb drain should be at least enough to fill a pint jar in less then 3 minutes and 2 minutes is even better