Farm Equipment - Allis B running weird

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Allis B running weird

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=207948
Printed Date: 27 Aug 2025 at 8:04am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Allis B running weird

Posted By: Ttague39B
Subject: Allis B running weird
Date Posted: 26 Aug 2025 at 12:06pm

Hi, I have a 1939 allis chalmers b that is idling fine, but as I start driving it it wants choke to run. The ajustment screw is nit changing anything, (im running it on a zenith carb full metal needle) and the other day when I went to start it it kept stalling after moving 10 feet, but would restart fine. A few days later it idled for about 15 minutes great, then went to move it and stalled right out. Any ideas or thoughts? Thank you.

Replies:

Posted By: Straanger
Date Posted: 26 Aug 2025 at 4:51pm

How old is the fuel? When was the last time you cleaned the carburetor?

Posted By: Ttague39B
Date Posted: 26 Aug 2025 at 4:55pm

Fuels maybe 2 months old, non ethanol, its only been a year, maybe two.

Posted By: steve(ill)
Date Posted: 26 Aug 2025 at 5:39pm

main jet plugged......... choke on means lack of fuel..

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Like them all, but love the "B"s.

Posted By: Orange B
Date Posted: 26 Aug 2025 at 5:39pm

hi, sounds like there is a blockage in the fuel line due to dirt either floating around in the tank , fuel line , or the screen in the fuel bowl. I have had that happen in the past on my 48 b. I would take the fuel line off at the carb see if the fuel flows freely , if not work towards the tank a section at a time till you get a free flowing line .

Posted By: Sugarmaker
Date Posted: 27 Aug 2025 at 6:09am

39B,

As others have suggested check for good fuel flow. I just had our freshened CA do something similar. Fuel was flowing good. It was the condenser in our CA! Yep sounds strange but it had no power ran only at idle and very rough! Might be worth a thought as you do trouble shooting on your B.

Looking forward to your updates.

Regards,

Chris and Cheryl

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D17 1958 (NFE), WD45 1954 (NFE), WD 1952 (NFE), WD 1950 (WFE), Allis F-40 forklift, Allis CA, Allis D14, Ford Jubilee, Many IH Cub Cadets, 32 Ford Dump, 65 Comet.