Allis B gas line
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=211831
Printed Date: 18 Sep 2026 at 9:23am Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Allis B gas line
Posted By: john2189
Subject: Allis B gas line
Date Posted: 29 Jul 2026 at 10:39am
I want to replace the rubber gas hose with the 1/4” copper tubing. I have seen it run both in front of and behind the air filter. Which is the factory install?
------------- '41 Allis B '49 Farmall Cub
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Replies:
Posted By: DrAllis
Date Posted: 29 Jul 2026 at 11:25am
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Behind and it makes things harder to work on I think.
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Posted By: PaulB
Date Posted: 29 Jul 2026 at 2:45pm
If you look at the pictures in operators manuals it will be behind the air filter. If you're not worried about it being as was done at the factory, why bother with hard line at all, just run a piece of hose wherever.
------------- 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
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Posted By: john2189
Date Posted: 29 Jul 2026 at 2:51pm
PaulB wrote:
If you look at the pictures in operators manuals it will be behind the air filter. If you're not worried about it being as was done at the factory, why bother with hard line at all, just run a piece of hose wherever. |
I don’t have a manual. I have rubber hose now. So I guess it works.
------------- '41 Allis B '49 Farmall Cub
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Posted By: steve(ill)
Date Posted: 29 Jul 2026 at 3:00pm
use the rubber hose and put an inline filter.. for LONG TERM fix..
------------- Like them all, but love the "B"s.
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Posted By: john2189
Date Posted: 29 Jul 2026 at 4:44pm
steve(ill) wrote:
use the rubber hose and put an inline filter.. for LONG TERM fix.. |
There is no filter, just the screen in the sediment bowl.
------------- '41 Allis B '49 Farmall Cub
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Posted By: steve(ill)
Date Posted: 29 Jul 2026 at 7:42pm
that is correct.... but when i buy a 75 year old tractor i put a small inline filter ( like off a lawn mower) to clean up any CRUD in the tank or anything that is added... that could PLUG a orifice in the carb... protect that carb... no rebuilds needed..
------------- Like them all, but love the "B"s.
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Posted By: john2189
Date Posted: 29 Jul 2026 at 8:16pm
steve(ill) wrote:
that is correct.... but when i buy a 75 year old tractor i put a small inline filter ( like off a lawn mower) to clean up any CRUD in the tank or anything that is added... that could PLUG a orifice in the carb... protect that carb... no rebuilds needed.. |
Thanks. The tank is very clean inside, but I did find a new piece of hose and a new fuel filter on my parts shelf. Who knows how old the rubber hose that is on it now. It’s pretty stiff and hard.
------------- '41 Allis B '49 Farmall Cub
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Posted By: Gary Burnett
Date Posted: 30 Jul 2026 at 6:26am
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I like the lines on the outside of the air cleaner on those style tractors,especially with using ethanol tainted gas it'll keep the fuel cooler and also want an inline filter.Its surprising what shows up in those filters.
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Posted By: SilverShoes
Date Posted: 30 Jul 2026 at 7:14am
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Funny, I use ethanol in my weed eater, chainsaw and lawnmower and have 0 issues with starting or operating. I haven’t ran them dry for winter for 2 years either. But I do try to keep them in a garage.
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Posted By: DiyDave
Date Posted: 30 Jul 2026 at 3:29pm
SilverShoes wrote:
Funny, I use ethanol in my weed eater, chainsaw and lawnmower and have 0 issues with starting or operating. I haven’t ran them dry for winter for 2 years either. But I do try to keep them in a garage. |
May be just luck, or Kansas doesn't get the same mix of fuel as say the northeast megalopolis. All 2 stroke I use here is Coleman camping gas plus the 2 stroke mix. If I did it your way here, I'd be spending on twice on carbs versus the $15/gal that the CCG costs me... 
------------- Source: Babylon Bee. Sponsored by BRAWNDO, its got what you need!
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Posted By: Gary Burnett
Date Posted: 31 Jul 2026 at 6:22am
DiyDave wrote:
SilverShoes wrote:
Funny, I use ethanol in my weed eater, chainsaw and lawnmower and have 0 issues with starting or operating. I haven’t ran them dry for winter for 2 years either. But I do try to keep them in a garage. |
May be just luck, or Kansas doesn't get the same mix of fuel as say the northeast megalopolis. All 2 stroke I use here is Coleman camping gas plus the 2 stroke mix. If I did it your way here, I'd be spending on twice on carbs versus the $15/gal that the CCG costs me...  |
Ever notice its the folks from corn growing areas that claim not to have problems with ethanol?
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Posted By: steve(ill)
Date Posted: 31 Jul 2026 at 10:09am
there must be variations across the country.. We live in Illinois and yes it is corn country... dont know how that effects it.. I bought a new F250 in 1989 and have used Ethanol in everything since then... mower, weed eater, chain saw, D17, Allis B, B&S mower, van, car, trucks.. everything for 35 years... That is 95% of what they sell in Illinois.. Yea, there are a few places you can buy "non ethanol" if you want to pay and extra $1. a gallon... but dont need that in Illinois... why, i dont know..??
------------- Like them all, but love the "B"s.
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Posted By: Ray54
Date Posted: 31 Jul 2026 at 10:46am
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I used gas out of farm tank I filled trucks and tractors at the ranch until 15 years ago, or near about. Then started having trouble with all the 2 stroke engines. Been using the over price stuff since. Still having more issues than 30 and 40 years ago.
But all fuel is junk compared to years ago.  But we are saving the world, so be happy to anything other than muscle power.  If only the almighty that make the rules would sweat more and think less.
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Posted By: DiyDave
Date Posted: 31 Jul 2026 at 3:28pm
Truth is there are dozens of "boutique" fuel formulations around the country. So where you are, and what the state you reside in decides which formulation of gasoline you get. Politics, in short...
------------- Source: Babylon Bee. Sponsored by BRAWNDO, its got what you need!
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Posted By: john2189
Date Posted: 31 Jul 2026 at 8:21pm
I kept the rubber hose but I added a fuel filter.
------------- '41 Allis B '49 Farmall Cub
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