Carburetor flooding
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=176563
Printed Date: 18 Jul 2025 at 6:19pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Carburetor flooding
Posted By: dfh9036
Subject: Carburetor flooding
Date Posted: 07 Dec 2020 at 8:37pm
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I just finished the restoration on my D15 Series II and I am having a problem with the carburetor flooding. I rebuilt the carburetor and replaced the fuel line and sediment bowl. The problem is that I am getting a rather large amount of gasoline coming out of the carburetor by the choke shaft and flooding up into the manifold. When I remove the bowl plug gasoline pours out as well. It is blowing gasoline out the muffler when it does start, which is difficult. Any idea of what the cause may be? Thanks.
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Replies:
Posted By: Sandman24
Date Posted: 07 Dec 2020 at 8:50pm
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I’m not familiar with that carb but sounds like the float maybe stuck or not adjusted properly
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Posted By: dfh9036
Date Posted: 07 Dec 2020 at 8:55pm
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Thanks for the email. Forgot to mention that it is a Marvel-Schreiber carburetor.
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Posted By: MACK
Date Posted: 07 Dec 2020 at 9:06pm
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Needle valve leaking. Seat not tight enough , Debra in seat, bad Needle valve and seat, float full of gas, float dragging on inside of carburetor , or improper adjusted . MACK
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Posted By: DaveKamp
Date Posted: 08 Dec 2020 at 8:09pm
Air filter still attached? Perhaps it is constricted?
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Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest.
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Posted By: dfh9036
Date Posted: 08 Dec 2020 at 10:53pm
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Checked air filter and connections. All good and no restrictions. Thanks for the thought.
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Posted By: jaybmiller
Date Posted: 09 Dec 2020 at 6:24am
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gee Mack listed all the ones I've ever seen.....(and had, sigh)... teardown the carb...if the float's 'heavy' or sloshes !, it's got gas inside.pinhole leak.easy fix...buy another $$$ float, easier fix, drain all gas from float,buff with 400-1000g paper,flux/solder the pinhole. I used propane torch, lightly, to find one pinhole. gas vapour spewed out of it like volcano smoke. I'd also clean the carb ,again (spray brake cleaner) and clean white cloth, as ANY buildup of 'varnish' can make needlevalve sticky.
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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)
Never burn your bridges, unless you can walk on water
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Posted By: dfh9036
Date Posted: 09 Dec 2020 at 6:58am
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Thanks for the input. I will take your advice and go through the carburetor with a fine tooth comb.
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Posted By: Sugarmaker
Date Posted: 09 Dec 2020 at 7:34am
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dfh, We need some pictures. Leaking spuing gas on a restored tractor not good! Also on most all of mine I have a habit of shutting the gas off each time I shut it off for the day. Was taught that from my Dad when these tractors were only several years old. Seems they had this issue even back then. All the advice given is on the mark. Something is not correct and the float is not lifting to shut the needle valve or the needle valve seat is not closing. Yes take it apart take some pictures, do a little research. put it back together and try it. Float function and needle valve seat are the things that shut off or let gas into the bowl. Looks those over very close. Floats can get bent and out or position too. Regards, Chris
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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.
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Posted By: Dusty MI
Date Posted: 09 Dec 2020 at 7:37am
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Instead of a torch, I would use an electric heat gun, or my wife's hair dryer, to find the hole and get the gas out.
Dusty
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917 H, '48 G, '65 D-10 series III "Allis Express"
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Posted By: john(MI)
Date Posted: 09 Dec 2020 at 10:48am
Did you adjust the float? Most likely problem.
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D14, D17, 5020, 612H, CASE 446
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Posted By: Dick L
Date Posted: 10 Dec 2020 at 6:15am
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If the float valve is seating/sealing properly no gas can get into the carburetor. You have to start there. A small speck of rust or carbon can lodge and hold it from sealing. Then you can move to other possible causes.
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Posted By: dfh9036
Date Posted: 10 Dec 2020 at 6:30am
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Thanks for all the input. I am planning on working on the carburetor this weekend and hopefully getting to the root of the problem.
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Posted By: mruhlig77
Date Posted: 10 Dec 2020 at 11:22am
The quality of new rebuild kits is suspect..new seats don't....
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Posted By: Steve in NJ
Date Posted: 10 Dec 2020 at 11:48am
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Sounds to me like a little chunk of dirt or debris is stuck to the needle valve. These valves make a great seal with that Nitril seal, but if a piece of debris comes into the Carburetor, it'll stick to that valve like fly paper. When you remove your Carburetor, remove the 90 degree inlet elbow and run a bore brush down that inlet cavity. A lot of rust and debris gets caught in those incoming threads over the years that aren't used and also debris gets trapped at the rear of the inlet cavity. Then, on occasions, lets loose from incoming fuel and gets caught in the needle valve hanging it up and causing a intermitant flooding situation. Whenever I do a rebuild on a customer's Carburetor, I always make that inlet shiny like its new with a small bore brush on a hand drill. You wouldn't believe the crap that comes outta there! Good luck! Hope you find the problem.... Steve@B&B
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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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