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Carb Leaking Gas
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lititzdoug
- Posts: 7
- Joined: Wed Jun 01, 2022 11:50 am
- Zip Code: 17543
Carb Leaking Gas
I have a 1948 Cub that starts and runs nice. When I shut it off and close the fuel valve, I will have gas dripping out of the carburetor. The time varies from a few minutes to overnight. Gas tank is clean, sediment bowl is clean. Any thoughts? Thank you!
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SamsFarm
- 501 Club
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Bob McCarty
- Team Cub
- Posts: 11860
- Joined: Tue May 25, 2004 8:02 pm
- Zip Code: 80501
- Tractors Owned: Cubs, MH Pony, Shaw, Allis G, 1934 Silver King, JD LA and LI, Gibson D, David Bradley Tri-Trac
- Circle of Safety: Y
- Location: CO, Longmont
Re: Carb Leaking Gas
If it's leaking after the sediment bowl valve is closed, there is probably debris keeping the valve seat from completely closing.
"We don't need to think more,
we need to think differently."
-Albert Einstein
we need to think differently."
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RedFred
- Cub Star
- Posts: 85
- Joined: Tue Jul 19, 2022 12:48 pm
- Zip Code: 00000
- Tractors Owned: 1948 Farmall Cub with 22 sickle mower,Grader blade with brackets for snow plow, Swaying draw bar,193 moldboard plow and a spring tooth field cultivator.
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Eugene
- Team Cub Mentor
- Posts: 20378
- Joined: Fri Jul 02, 2004 9:52 pm
- Zip Code: 65051
- Circle of Safety: Y
- Location: Mo. Linn
Re: Carb Leaking Gas
Dripping out the carburetor after fuel shut off at tank. Indicates two problem areas. Shut off valve and needle valve/seat.RedFred wrote:Where is it leaking?
I have an excuse. CRS.
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staninlowerAL
- 10+ Years
- Posts: 4993
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- Circle of Safety: Y
- Location: AL (Southwest)
Re: Carb Leaking Gas
Does it leak when the shutoff valve on the bottom of the tank is closed? I had a problamatic fuel shutoff valve and decided to install a quick open ball valve downstream from the sediment bowl. Here's how I made it work:
Stan in LA (lower AL)
USAF & Reserves, Reg ARMY, ARMY NG (AL)
USAF & Reserves, Reg ARMY, ARMY NG (AL)
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lititzdoug
- Posts: 7
- Joined: Wed Jun 01, 2022 11:50 am
- Zip Code: 17543
Re: Carb Leaking Gas
I opened the drain screw last evening to bleed the supply line and the carburetor. It stopped for a time then started leaking again. I am guessing that this tells me that flow is bypassing the closed valve because of debris or improper seating of the needle.
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Stanton
- Cub Pro
- Posts: 7760
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- Zip Code: 64070
- Tractors Owned: 1942 Farmall AV, serial #87025
1947 Farmall Circle Cub, serial #2116
1948 Farmall Cub, serial #46066 - Circle of Safety: Y
- Location: Lone Jack, MO
Re: Carb Leaking Gas
Lots of helpful threads about fuel in the How To forum. The ones by Lurker Carl are particularly good. Located here: http://farmallcub.com/phpBB2/viewforum.php?f=139
Sounds like nothing short of a careful disassembly and cleaning are in your near future. Ask us questions as/if you need to…
Sounds like nothing short of a careful disassembly and cleaning are in your near future. Ask us questions as/if you need to…
Stanton
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CharlieK
- 10+ Years
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lititzdoug
- Posts: 7
- Joined: Wed Jun 01, 2022 11:50 am
- Zip Code: 17543
Re: Carb Leaking Gas
Thanks to everyone for the feedback. As always, I am impressed with the knowledge of this group and willingness to share that knowledge.
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