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Allis B running weird

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Ttague39B View Drop Down
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Joined: 09 Aug 2025
Location: Tunkhannock PA
Points: 9
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    Posted: 15 hours 52 minutes ago 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.
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Straanger View Drop Down
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Joined: 10 Dec 2019
Location: Michigan
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Straanger Quote  Post ReplyReply Direct Link To This Post Posted: 11 hours 7 minutes ago at 4:51pm
How old is the fuel? When was the last time you cleaned the carburetor?
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Ttague39B View Drop Down
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Joined: 09 Aug 2025
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ttague39B Quote  Post ReplyReply Direct Link To This Post Posted: 11 hours 3 minutes ago at 4:55pm
Fuels maybe 2 months old, non ethanol, its only been a year, maybe two.
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
Location: illinois
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Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 10 hours 19 minutes ago at 5:39pm
main jet plugged......... choke on means lack of fuel..
Like them all, but love the "B"s.
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Orange B View Drop Down
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Joined: 28 Mar 2020
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Orange B Quote  Post ReplyReply Direct Link To This Post Posted: 10 hours 19 minutes ago 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 . 

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