Farm Equipment - Carburetor question

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Carburetor question

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=10489
Printed Date: 22 Jan 2025 at 7:27pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Carburetor question

Posted By: Morris Hill NC
Subject: Carburetor question
Date Posted: 02 Apr 2010 at 9:17pm

I just finished rebulding a G with a Marvel Schebler
carb on it , ran fine for about 15 minutes then it knocked
off from lack of gas. Sedling bowl was not full ,loosen bowl
it will fill up and run ,then it will give out of gas again?
lOOSEN bowl it will fill up and run, took gas cap off still does it ?
any help appreciated. Thanks
Morris

Replies:

Posted By: ChuckLuedtkeSEWI
Date Posted: 02 Apr 2010 at 9:36pm

so the only way gas is getting into the bowl is when you loosen the bottom side of the carb? there is something wrong with your float and needle valve, like its hanging up on the sides of the bowl. You should be able to blow into the fuel inlet on the side of the carb when it is off and the bowl is empty as the float should be down opening the needle valve. If not, somewhere in the float/needle assembly is your problem.

Posted By: Morris Hill NC
Date Posted: 02 Apr 2010 at 9:49pm

Chuck
When i loosen the bail on sedling bowl carb & bowl will
fill up , it will run fuel out & no more will come in until
bowl is loosened again.
Morris

Posted By: ChuckLuedtkeSEWI
Date Posted: 02 Apr 2010 at 10:17pm

So the sediment bowl that is under the gas tank? is what you loosen up to get the fuel to come out? I don't have a G, so I'm going by what my other tractors do. If the fuel line is off of the carb, do you have good fuel pouring out of the fuel line? With the valve on the sediment bowl open and the fuel line off of the carb, the gas tank should just empty out and fuel should run out steady. Make sure that is working properly and then deal with the carb.

Posted By: Eldon (WA)
Date Posted: 02 Apr 2010 at 10:26pm

I'd take the tank off and clean it...I think you have a flow problem.....

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Posted By: Morris Hill NC
Date Posted: 02 Apr 2010 at 10:27pm

Sedling bowl is beside of carb, with bowl lose it will fill bowl and carb,
tightin bowl it will crank and run gas out of carb and out of about 1/8
of a inch out of bowl and stop? But when u loosen bowl gas will start running again?

Posted By: ChuckLuedtkeSEWI
Date Posted: 02 Apr 2010 at 10:31pm

can you take some pictures of the sediment bowl assembly? If you don't know how to load them up, email them to me and I will load them on here.

mailto:chuckluedtke@hotmail.com - chuckluedtke@hotmail.com

Posted By: Morris Hill NC
Date Posted: 02 Apr 2010 at 10:38pm

will try tommorow , thanks

Posted By: LouSWPA
Date Posted: 02 Apr 2010 at 10:42pm

What Eldon said!

Posted By: dadsdozerhd5b
Date Posted: 03 Apr 2010 at 7:03am

did you just rebuild the carb and make your own gasket? it sounds like the hole that allows the air in and out of the carb naturally is blocked, either with debris or a gasket is covering the hole. it will be a small hole. check the bowl of the carb against the carb and make sure all holes are open and not blocked with gasket. also, if air cleaner bolts to carb like small engines, hole could be blocked there also. it sounds like the carb cannot expell the air in the bowl to allow gas to come in. it happens.

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HD5B, HD5G, (2) FARMALL A's, CUB. DO IT RIGHT THE FIRST TIME, IGNORE THE LAUGHTER. FLANNEL IS ALWAYS IN STYLE.

Posted By: Dick L
Date Posted: 03 Apr 2010 at 11:48am

Ya, what dadsdozerhd5b said. The carburetor has to have an air outlet. Loosening the bowl not only lets gas fill the bowl but relieves the head pressure from the carburetor. There is a small hole in the top part that could be clogged with paint or something.

Posted By: Morris Hill NC
Date Posted: 03 Apr 2010 at 4:35pm

took carb 7 bowl off cleaned all holes put new bowl gasket on
SAME problem , will try again tuesday THANKS for all of the help.
Morris

Posted By: Morris Hill NC
Date Posted: 03 Apr 2010 at 4:37pm

That 7 should have been a & , sorry about that