1951 farmall cub starts easily then dies

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brakesnake
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1951 farmall cub starts easily then dies

Postby brakesnake » Wed Jul 19, 2017 1:08 pm

Cub starts easy then dies had the carburetor rebuilt coil replaced resistor replaced. If you let it set it will start again and run for about a minute. If you choke it it makes it worse when it's starting to die. Let it sit for about an hour and it starts right up again. It will fire and try to start after the first time but it won't stay running.

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Shane N.
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Re: 1951 farmall cub starts easily then dies

Postby Shane N. » Wed Jul 19, 2017 1:17 pm

It's either starving for gas or your float isn't adjusted right in the carb. Have you taken the cut off out of the tank and cleaned it real good? Does it have a steel or rubber fuel line?
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brakesnake
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Re: 1951 farmall cub starts easily then dies

Postby brakesnake » Wed Jul 19, 2017 1:31 pm

I put new rubber lines on it with an in-line fuel filter so I can watch the fuel level. It did this before I had the carburetor rebuilt and before I change the fuel lines and it still doing the same thing. And yes I took the strainer ball down and cleaned it.

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Shane N.
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Re: 1951 farmall cub starts easily then dies

Postby Shane N. » Wed Jul 19, 2017 1:35 pm

Probably the filter then, there are 2 different kinds. One is for a system with a fuel pump and one without, I've ran into this problem before. If it's not that then I would suspect something is up with the carb itself.
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brakesnake
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Re: 1951 farmall cub starts easily then dies

Postby brakesnake » Wed Jul 19, 2017 2:01 pm

There is only one fuel filter. This carb does not have a fuel pump. New strainer on carburetor. And new in-line filter that I can see through getting gas. I have tried everything I can think of

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Shane N.
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Re: 1951 farmall cub starts easily then dies

Postby Shane N. » Wed Jul 19, 2017 2:09 pm

No fuel pump? I'm stumped. Hopefully someone with more knowledge can help you.
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Re: 1951 farmall cub starts easily then dies

Postby Eugene » Wed Jul 19, 2017 2:12 pm

Try a gravity fed inline fuel filter.

Remove the plug on the side of the carburetor. Sediment bowl valve fully open - turn until it back stops. Catch the fuel, let drain for a minute or two watching the fuel flow. You can do the same process by removing the fuel line hose to the carburetor - and then above the inline fuel filter. Trying to locate the fuel flow blockage.

Screen in carburetor inlet plugged.
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brakesnake
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Re: 1951 farmall cub starts easily then dies

Postby brakesnake » Wed Jul 19, 2017 7:45 pm

Thanks for all the help. Still a work in process. Trying all suggestions. It is a up draft carb. Is it possible I have governor problems>

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Rick Spivey
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Re: 1951 farmall cub starts easily then dies

Postby Rick Spivey » Wed Jul 19, 2017 8:36 pm

Governor usually doesn't cause one to stop running. I don't suspect governor, but rather fuel starvation. One more thing to check, the gas cap should be vented; sometimes the vents are stopped up. Try removing gas cap and see if it keeps running (while stationary, of course).
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brakesnake
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Re: 1951 farmall cub starts easily then dies

Postby brakesnake » Fri Jul 21, 2017 12:12 pm

You all were on track with the strainer bowl and in line filter. Runs longer now but still dies after about two minutes. still thinking carburetor somehow.

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Shane N.
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Re: 1951 farmall cub starts easily then dies

Postby Shane N. » Fri Jul 21, 2017 12:13 pm

brakesnake wrote:You all were on track with the strainer bowl and in line filter. Runs longer now but still dies after about two minutes. still thinking carburetor somehow.

I would say you need to adjust your float. It's obviously not getting enough gas in the bowl to stay running after it runs what's in the bowl out and if you've fixed the strainer and filter problem the float adjustment is really all that's left. Did you try what Rick said with the gas cap? You can get a new gas cap for free here http://ihgascap.com/
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Re: 1951 farmall cub starts easily then dies

Postby ntrenn » Fri Jul 21, 2017 2:51 pm

With the tank valve on and the plug out of the bottom of the carb, how fast does the fuel run? If its a stream, fuel supply is enough.

What type of needle did you use in the carb rebuild? Rubber ones can stick.

I recently encountered stuck floats and needles on an old motorcycle...all 4 of them...just the slightest bit of friction will stick both needles and floats...


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