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Weird Carb Leak on a G

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=178592
Printed Date: 29 Apr 2025 at 4:11am
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Topic: Weird Carb Leak on a G
Posted By: green
Subject: Weird Carb Leak on a G
Date Posted: 24 Feb 2021 at 8:51pm
Ok, tell me if I'm crazy (based only on the following).

Carb on a G has had slow leak all season, always just turned the gas off when parking it.  Finally took it off to see about a fix, propped the top half up by the float with a dummy tank to see if the needle would suffice to shut off the gas, and I decided to pour some gas in the bowl just to check.  Sure enough, float stayed dry all night and a little pool formed under the bowl.  Ok, I thought I could maybe figure out which screw was leaking by drying everything well and pouring just a little gas in.  Hours later, no puddle, nothing shiny on either screw's threads.  Carefully added more gas to the bowl, and actually could watch it "climb" up like a sponge and reach the rim.  Waited a bit, and sure enough the whole outside of the bowl was wet after a couple hours with a puddle below it.  The gas climbs out.  Maybe if I tighten the whole unit it back together with its gasket it will stay inside.  Anyone seen this before?  Does it maybe imply that the bowl is filling too high and need to bend the float down?  Thanks in advance.



Replies:
Posted By: Steve in NJ
Date Posted: 25 Feb 2021 at 1:54pm
Usually, on the TSV Carbs that are on the G's, the cast aluminum in the bottom of the float bowl starts to rot, and the fuel will actually creep through the float bowl floor and drip on the barn floor. To repair those particular customer Carbs with that issue is I whip up a batch of epoxy and pour a new floor in the bottom of the float bowls. That usually takes care of that issue. Depends on how thin the floor is. Sometimes it takes two pours to get the floor filled in to save the Carburetor. As far as the creeping up the bowl wall is concerned, I've never seen that, but could be the same problem. The crappy cast aluminum is absorbing the fuel and it "wicks" up the side of the Carb.  They used pretty crappy cast aluminum on those particular Carburetors.  I don't know if the new replacement ones that are offered are any better.  They aren't bashful on the price I can tell ya that...   HTH
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


Posted By: Mikez
Date Posted: 26 Feb 2021 at 1:37pm
welcome to forum



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