Model "B"&CA fuel lines?
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=149176
Printed Date: 19 Sep 2025 at 3:31am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Model "B"&CA fuel lines?
Posted By: Hunt4Allis
Subject: Model "B"&CA fuel lines?
Date Posted: 05 Apr 2018 at 10:38am
|
Both my B and CA fuel lines leak when I turn off fuel at bottom of bowl Best fix? Any specific type copper lines or fittings? |
Replies:
Posted By: The Consultator
Date Posted: 05 Apr 2018 at 10:41am
|
I had to loosen and adjust the alignment of my B's line going into the bowl. It they are just a bit wonkey, the nut won't lock down enough to squeeze the flared end into the bowl. I also used plumber's tape on all the threads. ------------- 1939 Allis-Chalmers "B" restored in 2010- very good condition. |
Posted By: Hunt4Allis
Date Posted: 05 Apr 2018 at 10:42am
| Ok, maybe I just need to add tape( is it fuel specific type or just Teflon?) |
Posted By: The Consultator
Date Posted: 05 Apr 2018 at 10:51am
|
I just used Teflon from Napa. Nothing special. It took a few tries to get everything lined up. Remember that the threads and fittings are soft metal, and if they are off a bit, it can be easy to strip them out when tightening them down. I had to adjust my fuel bowl positioning as well. Luckily I had room to play and still remain sealed under the tank. ------------- 1939 Allis-Chalmers "B" restored in 2010- very good condition. |
Posted By: Hubert (Ga)engine7
Date Posted: 05 Apr 2018 at 11:01am
|
Be careful if you use teflon tape and don't let a small piece get into the carb. Steve in NJ (bb-customcircuits.com) makes excellent replacement fuel lines if you need some. ------------- Just an old country boy saved by the grace of God. |
Posted By: The Consultator
Date Posted: 05 Apr 2018 at 11:03am
|
Indeed. Steve does exceptional carb work as well! ------------- 1939 Allis-Chalmers "B" restored in 2010- very good condition. |
Posted By: Hunt4Allis
Date Posted: 05 Apr 2018 at 11:11am
| Where mine is leaking from is right at the little wing nut valve |
Posted By: Jim Hancock
Date Posted: 05 Apr 2018 at 11:59am
|
Have you tried tightening up the packing nut some? ------------- How blessed we are by HIS GRACE! |
Posted By: Hunt4Allis
Date Posted: 05 Apr 2018 at 12:00pm
| No, but will |
Posted By: steve(ill)
Date Posted: 05 Apr 2018 at 12:06pm
|
If that doesn't seal it up, unscrew the nut all the way and pull the nut and needle valve off the tractor. Look a the packing... sometimes you can take a small piece of string a couple inches long and wrap it around 5-6 times and give the old packing some BACKUP and then you will have enough adjustment to seal the leak. ------------- Like them all, but love the "B"s. |
Posted By: Hunt4Allis
Date Posted: 05 Apr 2018 at 12:09pm
| Thanks guys |
Posted By: Dick L
Date Posted: 05 Apr 2018 at 12:18pm
Copper is not a good choice for your fuel lines. Copper is soft and you can over tighten copper to where when you retighten after removing the line it will not seal properly. Steel brake line is the best. The very best would be to flair the ends but the compression fittings are good on steel also. Teflon tape is good on the fittings pipe threads as well as any good pipe dope. Keep the tape back from the first thread and it will not give a problem. Tape or dope on the compression nuts does no good. |
Hunt4Allis wrote:Posted By: Hunt4Allis
Date Posted: 05 Apr 2018 at 1:06pm
| Both my model B and model CA have copper gas lines |
Posted By: sparky
Date Posted: 05 Apr 2018 at 1:11pm
|
I suggest steel replacement like factory. ------------- It's the color tractor my grandpa had! |
Posted By: Dakota Dave
Date Posted: 05 Apr 2018 at 1:51pm
| If it's leaking fuel with the valve turned off the problem is not the fuel lines. It's the packing on the shutoff valve. When you turn the valve on and back off the compression nut behind the wing nut there is a packing in there. Try to tighten that first. If that fails your best bet is replace it. Unfortunately you need to buy a new sediment bowl assembly. As that packing is not available. |
Posted By: Dick L
Date Posted: 05 Apr 2018 at 6:48pm
You can make your own packing for those with the Teflon tape. spin the tape in your fingers to make it like a string and wrap it around the stem in front of the cap. A waxed string works also. |
Posted By: Hunt4Allis
Date Posted: 05 Apr 2018 at 6:49pm
|
Good to know Thanks all |
Posted By: cjallis
Date Posted: 05 Apr 2018 at 6:50pm
| If it still leaks. I suggest getting new fittings and maybe fuel lines off Ebay or Steiner says the original lines. |
Posted By: PaulB
Date Posted: 06 Apr 2018 at 3:57am
|
There was an extensive discussion on fuel line a week or so ago. Copper is maybe about the worst choice for a line for hazardous material. Much too easilyprone to cracking and leaking from vibration. ------------- If it was fun to pull in LOW gear, I could have a John Deere. Real pullers don't have speed limits. If you can't make it GO... make it SHINY |
Posted By: Hunt4Allis
Date Posted: 06 Apr 2018 at 4:04am
| Ok, good to know |
Posted By: Ted J
Date Posted: 06 Apr 2018 at 1:43pm
------------- "Allis-Express" 19?? WC / 1941 C / 1952 CA / 1956 WD45 / 1957 WD45 / 1958 D-17 |
Posted By: Brian Jasper co. Ia
Date Posted: 06 Apr 2018 at 8:18pm
|
There's nothing wrong with using copper for a fuel line. I have a large collection of old small engines and most of them that use a separate carb and tank like Lauson did use a copper fuel line. The bowl with the wing nut is your fuel filter. It's not a good idea to use any sort of sealer because little bits can end up breaking loose and going to the carb and block the float valve, jamb the float valve open, or end up in a jet. Because of the length involved I would recommend using steel. You can buy steel lines with double flare fittings like used for brake lines. There is also NiCop (nickel copper) that is also approved for brake use and is much easier to bend. Those sediment bowls if they leak, can be frustrating at times to stop from leaking. New ones are not that expensive. ------------- "Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford |