Yesterday's Tractor Co. Low Prices, Parts Ship Fast!
Click Here or call 800-853-2651 
   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver
Tractor Manuals
Tractor Parts
Classified Ads
Photo Ads

Discussion Forums
Project Journals
Tractor Town
Your Stories
Show & Pull Guide
Events Calendar
Hauling Schedule

Tractor Photos
Implement Photos
Vintage Photos
Help Identify
Parts & Pieces
Stuck & Troubled
Vintage Ads
Community Album
Photo Ad Archives

Research & Info
Tractor Registry
Tip of the Day
Safety Cartoons
Tractor Values
Serial Numbers
Tune-Up Guide
Paint Codes
List Prices
Production Nbrs
Tune-Up Specs
Torque Values
3-Point Specs

Tractor Games
Just For Kids
Virtual Show
Museum Guide
Memorial Page
Feedback Form

Yesterday's Tractors Facebook Page

Related Sites
Tractor Shed
Ford 8N/9N Club
Today's Tractors
Garden Tractors
Classic Trucks
Kountry Life
Enter your email address to receive our newsletter!

Case Tractors Discussion Forum
Show Parts for Model:

56 310 Roundnose Carb Float Mystery?

Author  [Modern View]

11-05-2013 05:04:38

Report to Moderator

I bought a new Zenith carb for my 56 Case 310 Roundnose last year (Here on YT), and 50 hrs of running time later the tractor won't run unless mostly choked and when I turn the tractor off, the carb leaks gas bad and will empty the tank. Bowl is filling and gas just keeps right on comin? ........ OK, gotta be the float assembly I think, needle has to get pushed up to stop gas from entering the carb right? Hmmm maybe it is sticking partially and not enough gas can get in to allow normal running and then when the engine is not using the fuel, it continues to fill the carb and leaks out....... Removed the carb, cleaned it even though it really looked like new. Float and needle assembly moves freely and floats (no pinhole or seam tear). I could find no evidence of binding or sticking and could not make it hang up on the bench so it is spotless.... back on the roundnose it goes. I also removed the tank, cleaned it and sediment bowl. They looked fine and fuel flow to carb was excellent but I wanted to be sure. Clean gas, no leaks, starts right up and purrs and off I go for about 30 minutes..... then she wont run above idle unless choked and after stopping the engine, the gas continues to enter carb and will empty the tank again. Tapped on bowl with hammer while running and though maybe that old trick might work with no luck. Am I missin something? Seems to me the float assembly has to be suspect as it is the common point for not enough gas to run and not stopping the fuel flow after the engine is not using it?

I hate to replace parts without evidence but I am stumped. Sure don't want to buy another carb yet. Anyone have experience with a new Zenith from this site? Appreciate any thoughts you have.
This post was edited by rasman57 at 05:05:15 11/05/13.

[Reply]   [No Email]
Ed Hamlin

12-11-2013 05:38:02

Report to Moderator
 Re: 56 310 Roundnose Carb Float Mystery? in reply to rasman57, 11-05-2013 05:04:38  
Had my carb off 4 times, not wanting to remove the "TINY" brass plug under the Large high speed needle, in the bottom of the carb bowl, afraid that I would break/destroy it. After I removed it and blew the bowl out well. Re- assembled/installed the carb. It has run like a champ. Couldn't believe it was so simple. Hope this works for you. I also added an inline fuel filter to keep out any possible fine dirt.

Owner of a 1957 310, Backhoe/Loader, almost completely redone.

[Reply]  [No Email]

11-05-2013 09:48:32

Report to Moderator
 Re: 56 310 Roundnose Carb Float Mystery? in reply to rasman57, 11-05-2013 05:04:38  
Sounds like you are doing everything right, I always gently shake it back and forth to listen for the float moving. Iv had more than one apart twice before I got it right.

[Reply]  [No Email]

11-05-2013 09:46:08

Report to Moderator
 Re: 56 310 Roundnose Carb Float Mystery? in reply to rasman57, 11-05-2013 05:04:38  
i recently had problems w/ oliver 77 carb float setting on marvel tsx363. is similiar so make sure needle valve body and gasket are secured to carb preventing slow leak. make sure needle and valve body seem to fit and rotate freely and visually seal. get a good set of directions and set float height. i missed on mine that 1/4 inch was with gasket. take pussein blue or blue kote on sides of float and see that float is not contacting side of carb when assembled and no gas added. inspect that there are not burrs to rub against and lodge float. i did not bend tab but adjusted tang for height so that would not rub. the kits one buys now are very poor quality and tolerances are poor. it worked aok for a week. then stuck once. ran it and aok. on my ihc 400 i removed sediment bowl and installed a fuel filter / water separator and it work aok always. any spec of water, dirt or ice will affect needle sealing. once float is set you can adjust idle, low idle adjust and power. also check linkages that they are slide free and no rubbing. then make sure govenor settings are correct.

[Reply]  [No Email]

11-05-2013 06:44:03

Report to Moderator
 Re: 56 310 Roundnose Carb Float Mystery? in reply to rasman57, 11-05-2013 05:04:38  
What casecollectorsc says makes the most sense to me. I run 10% ethanol in all my gas engines. I don't have any fuel problems. Just my experience. gobble

[Reply]  [No Email]
Just a Hunch

11-05-2013 06:32:14

Report to Moderator
 Re: 56 310 Roundnose Carb Float Mystery? in reply to rasman57, 11-05-2013 05:04:38  
I have had the same problem on several tractors since they started adding Ethonol to the fuel. If you can find some Ethonol free fuel it will probably fix the problem.

[Reply]  [No Email]

11-05-2013 06:02:37

Report to Moderator
 Re: 56 310 Roundnose Carb Float Mystery? in reply to rasman57, 11-05-2013 05:04:38  
Float hanging up on the side of the bowl?? I have used a flap wheel on a die grinder to smooth the inside of the bowl...

[Reply]  [No Email]
[Options]  [Printer Friendly]  [Return to Forum]   [Add a Reply]

Hop to:
Same-Day Shipping! Most of our stocked parts ship the same day you order (M-F).  Expedited shipping available, just call!  Most prices for parts and manuals are below our competitors.  Compare our super low shipping rates!  We have the parts you need to repair your tractor.  We are a Company you can trust and have generous return policies!   Shop Online Today or call our friendly sales staff toll free (800) 853-2651. [ More Info ]

Home  |  Forums

Copyright © 1997-2014 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters