Gas Line At Fuel Bowl Leaking

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jim5644
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Gas Line At Fuel Bowl Leaking

Postby jim5644 » Fri Jul 09, 2021 8:21 pm

Would somebody be kind enough to help me with a problem. Took the hood off a 1970 IHC Cub and now I can not get the gas line fitting at the fuel bowl to stop leaking. IT has an odd type thin brass or copper washer and then the nut to attach the line to the fuel bowl. There is no barrel type compression fitting on the line just the little thin washer and the line will just not stop leaking. Could I use a barrel type compression fitting at fuel bowl? The other end of the metal line that goes to the carb does have a barrel compression fitting. The little thin washer will only fit on the very end of the line and that is with a lot of pressure.
Appreciate any help and you guys have saved me before.

Bob McCarty
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Re: Gas Line At Fuel Bowl Leaking

Postby Bob McCarty » Fri Jul 09, 2021 9:06 pm

There usually is a compression fitting at the sediment bowl. I can't visualize how yours is set up. Shouldn't be any problem to switch to a compression fitting. TM Tractor sells them with the ferrule, 1/2-20 thread, not pipe thread. http://www.tmtractor.com/new/fl/512fp.htm
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jim5644
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Re: Gas Line At Fuel Bowl Leaking

Postby jim5644 » Fri Jul 09, 2021 9:49 pm

Bob, the fitting at the fuel bowl is the 5/16 line fitting, but it has a thin maybe 1/16 inch thick brass or copper almost like a washer. The other end to the carb does have a barrel feral and the line nut. Just want make sure I can get away with using a barrel feral on the fuel bowl before I mess something up.

Appreciate any advice as I've never seen another set up like this either.

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Re: Gas Line At Fuel Bowl Leaking

Postby tldec50 » Sat Jul 10, 2021 3:56 pm

Maybe someone put a flare on that end and it has broken off.

jim5644
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Re: Gas Line At Fuel Bowl Leaking

Postby jim5644 » Tue Jul 13, 2021 11:56 am

Thanks tldec, but whatever the apparent washer type thing is it was designed to be what it is. It appears to be something especially designed to function with the line nut at the fuel bowl. It definitely is not the end of a flare on the end of the line.
I appreciate your help though and thought.

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Re: Gas Line At Fuel Bowl Leaking

Postby tst » Tue Jul 13, 2021 2:19 pm

they did use a kinda thick copper washer before replacing them with the common ferrule that is used now, you can just toss the washer and use the ferrule that is what IH also did in the replacements

jim5644
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Re: Gas Line At Fuel Bowl Leaking

Postby jim5644 » Wed Jul 14, 2021 6:48 pm

tst thanks so much for you help and advice. Was beginning to think I had a one of a kind thing.
Appreciate your help.

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Re: Gas Line At Fuel Bowl Leaking

Postby SamsFarm » Wed Jul 14, 2021 7:02 pm

How about posting some pics.

Everyone might be able to help you better!

jim5644
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Re: Gas Line At Fuel Bowl Leaking

Postby jim5644 » Thu Jul 15, 2021 12:45 am

SamsFarm great idea about posting a picture, but I don't know how to do that.
In any case I finally got it to stop leaking and unless it starts leaking again am not about to take it loose. Finally rigged it up by putting an o-ring between the washer and the line nut and tightening it. If it starts leaking again will put a barrel ferrule on it as tst suggested.
Thanks for your suggestion and will try to figure out how to do a picture on future problems.

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Re: Gas Line At Fuel Bowl Leaking

Postby Glen » Thu Jul 15, 2021 1:12 am

Hi,
Below are listings at TM Tractor.
The 1st is a new gas line for Cubs with under axle exhaust systems, which the 1970 Cub you have probably has. You can look at the pics.

http://www.tmtractor.com/new/fl/373fp.htm

The 2nd listing shows the nut for the gas line, like Bob posted above.
When it is new, it will slide on the tube, then when you tighten it in place the 1st time, the ring shrinks some on the tube, so it is tight on the tube, and breaks loose from the nut. After that, the nut will turn on the tube, but the ring is tight.
That is how the ones I bought worked, I guess these work the same way. :)

http://www.tmtractor.com/new/fl/512fp.htm

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Re: Gas Line At Fuel Bowl Leaking

Postby Stanton » Thu Jul 15, 2021 6:36 am

jim5644 wrote:SamsFarm great idea about posting a picture, but I don't know how to do that.
In any case I finally got it to stop leaking and unless it starts leaking again am not about to take it loose. Finally rigged it up by putting an o-ring between the washer and the line nut and tightening it. If it starts leaking again will put a barrel ferrule on it as tst suggested.
Thanks for your suggestion and will try to figure out how to do a picture on future problems.


To answer your earlier question, no, you won't mess anything up by putting a compression fitting on that end of the gas line (just like the other end). As Bob stated, be sure it's a 1/2-20 thread count and not a plumbing fitting.

Here are a couple references describing attaching photos to a post:
How to Upload Pictures to a Post
Forum Picture Posting And Other Interesting Things You Can Do

Also, you might find this helpful thread in the How To Forum: "How to Make a Steel Gas Line for Your Cub"
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jim5644
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Re: Gas Line At Fuel Bowl Leaking

Postby jim5644 » Thu Jul 15, 2021 12:37 pm

Thanks everyone for all the advice and help. It is go great to have this forum and everyone so helpful
Thanks again and hope everyone has a fantastic day.
Have a good solution now if the problem returns.

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Re: Gas Line At Fuel Bowl Leaking

Postby AriesEd68 » Sun Jun 12, 2022 2:28 pm

Just noticed this thread and my 1974 Farmall 140 had apparently the same flat washer, I assume it was brass, on the end of the 5/16 fuel pipe that goes into the sediment bowl assembly but I lost the little washer on the ground and I’ve read that a newer ferrule brass piece can be substituted? But, I am confused about the size of the ferrule. Does it have to slide onto the fuel pipe and does it have to be connected to the larger nut that screws into the sediment bowl or not? It still leaks around the outside of the nut and the fuel pipe and I cannot stop it from leaking when I turn on the fuel.

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Re: Gas Line At Fuel Bowl Leaking

Postby staninlowerAL » Sun Jun 12, 2022 2:59 pm

AriesEd68 wrote:.....the size of the ferrule. Does it have to slide onto the fuel pipe and does it have to be connected to the larger nut that screws into the sediment bowl or not?........
The ferrule does not have to be connected to the nut and is available. The OEM type is designed to break free the first time the assembly is installed but the inherent problem is the casting material of the part is somewhat soft and tightening the nut to the point that the ferrule breaks free sometimes causes the threads in the sediment bowl/carburetor to get damaged and then you have a greater problem. A recent thread addressed this problem with a solution but I cannot remember where I saw it. Maybe someone can post a link to the thread. My procedure when installing a new nut/ferrule that is a one piece type is to tighten it into a brass fitting to get it tight enough to break the ferrule loose then remove and install on the desired fitting.

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Re: Gas Line At Fuel Bowl Leaking

Postby Jim Becker » Sun Jun 12, 2022 3:35 pm

staninlowerAL wrote:. . . Maybe someone can post a link to the thread. . . .

How about the old part of this thread?

The ferrule should be just large enough to freely slide onto the tube.


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