(800) 853-2651
SHOP NOW

F-12 Type A10 Carb. Fuel Line

B

Bill Copeland

Member
On a gas only F-12 how large should the hole be in the return tee at the gas tank?-- When you split the carb. there is a small brass nipple that fits into a hole in the top part of the carb. Where does this go? and should I be able to blow it out with an air compressor? I have taken 3 carbs. apart and cannot get air thu any of them. Is this just an aglinement pin?
The problem I am trying to solve is too much gas.Neither high or low jet adjustment leans it out at all.
 
Sounds like a heavy or misadjusted float. If the float is good, Try bending the tang to lower the fuel level a bit.
 
If you look closely at the brass "alignment pin", you will see a tiny hole in the end of it about the diameter of a guitar string. I have soaked and blown and scraped it out(with an old guitar string!) My F12 now will run, but only with the choke on. I soaked the whole dismantled carb in cleaner for 2 days, installed a new needle, seat and gaskets with no change. I had heard these carbs could be difficult but I've never run into anything like this before. Good luck on yours and if you come across any info, PLEASE share it!
 
The "alignment pin" is the idle metering jet and it needs to be open so the idle circuit works. The main jet should still have some effect though. Thats why I think your fuel level is too high. There are 4 different versions of this carb so I'm guessing which is right but here is a breakdown that helps. If you study it carefully you can see where the passages go.

4788238703_1492cdbe6a_b.jpg


4788237399_8216773c1b_b.jpg
 
You must log in or register to reply here.

Similar threads

M
TO-20 TSX361 carb questions
Replies
11
Views
791
Mad Farmer
M
G
A10 downdraft carb
Replies
5
Views
477
Janicholson
Janicholson
R
Fuel issues with 1936 F12....I think.
Replies
15
Views
649
Rob41
R
W
leaking carb Cub
Replies
5
Views
1K
old
O
D
Aftermarket downhill only carburetors
Replies
4
Views
388
Dave G9N
D
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