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 2:15am
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 .