(800) 853-2651
SHOP NOW

air in the sdiment bowl

T

TEXAN Connection

New User
My 1964 cub has a bit of a fuel problem, it will be mowing along fine then start missing a bit, like fuel starving. happens mostly when i get in a heavy grass spot, but wont come back after I get out of it. have to get it back to the shed working the chock in and out, or full chock., Iv notice when it does this its getting air bubbles into the sediment bowl from the tank, While running) and if you look in the tank with a flash light, its really blowing bubbles from the petcock inlet. I usually blow it back into the tank through the line and clean the little port with the 3/8 nut on the side of the carb and it goes along just fine again for a hour or so. wondering if any one has a clue to the problem..
 
If I run my M with about a quarter of a tank I get that. Only when grinding feed, though.

There is a bearing or something on your machine causing just the right resonance to make the fuel in the tank hop. Then it sucks air kind of like if you drink your soda through a straw with a hole in it. I just make sure I have at least half a tank when I grind feed.

Make sure your tank is good and clean, too.
 
I must have misread your post. I was thinking something completely different. Sorry about that. Id have to agree and say the tank needs cleaning out.
 
Heavy load causing higher operating temps, boils gas in the line and viola....VAPOR LOCK. The bubbles in the tank are vaporized fuel. Gravity pulls fuel down, bubbles force it back up, engine starves for fuel. Won't return to normal flow until the temperature drops on whatever is heating the fuel line. Hard to say whats doing it without seeing and knowing if you fuel lines are stock, rubber hose, inline filter, etc...etc... Sometimes something as simple as a wooden clothespin clamped on a steel fuel line is a good enough heat sink to stop it.
 
From your description I would say you have fuel boiling in the fuel line. The vaporized fuel is bubbling back up into the fuel tank.

This problem is usually called "vapor lock". In a vehicle with the fuel tank below the carburetor and using a fuel pump the vapor does not return to the tank but is trapped in the fuel line. The vapor has to pass through the float valve in the carburetor which keeps liquid from entering and the engine dies due to "Vapor Lock". In your case the vaporized fuel can escape back up into the fuel tank allowing some liquid to continue to flow down into the carburetor, just not enough to allow the engine to run normally.
 
I was thinking Vapor lock as well, but folks always seem to blame that, but it was definetly rolling in the tank from the petcock. Its not stock and all rubber.
a157759.jpg
 
HOPE U FIND UR PROBLEM. JUST A NOTE, I BURNED A BARN,TRACTOR, AND HOUSE COMPLETELY WITH THE SAME SETUP AS THE PIC SHOWS. NEVER USE A RUBBER HOSE FROM TANK TO CARB. LOOKS AS IF IT IS ALREADY TOUCHING THE EXHAUST PIPE. IF SO, THIS IS PROBLEM, AND IT WONT BE LONG. NOT NEGATIVE, JUST TRYING TO KEEP U SAFE.
 
(quoted from post at 18:19:20 05/22/14) I was thinking Vapor lock as well, but folks always seem to blame that, but it was definetly rolling in the tank from the petcock. Its not stock and all rubber.
a157759.jpg
Click to expand...

That picture is worth a thousand words. You really need to get the proper fuel lines on that tractor asap. Your fuel boiling problem will disappear and you'll save yourself some future problems. Imagine burning fuel being blown by the fan right at you + greasy tractor = Big fire fast. There are going to be people who claim that they have run rubber lines for years with no problems, but on your cub the lines run right by the manifold and exhaust pipe, unlike an H or M or many others where the exhaust goes straight up and the carb is well below.
 
You must log in or register to reply here.

Similar threads

B
Farmall 350 Fuel Tank Screen Question
Replies
11
Views
380
cleddy
C
N
Gas Tank and Glass Bowl not filling
Replies
10
Views
621
NW-FLORIDA
N
T
Earth magnets
Replies
12
Views
992
504
5
H
Massey 180 Fuel Filter bowl
Replies
3
Views
134
stevieb49829
stevieb49829
M
Oil leak at air pump
Replies
2
Views
263
Mike(NEOhio)
M
Tractor Parts Tractor Manuals

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Copyright © 1997-2024 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
Website Accessibility Policy

Back
Top