Carb Leaking Gas

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lititzdoug
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Carb Leaking Gas

Postby lititzdoug » Tue Jul 19, 2022 1:54 pm

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!

SamsFarm
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Re: Carb Leaking Gas

Postby SamsFarm » Tue Jul 19, 2022 2:10 pm

Could be;

Stuck float
Bad needle and / or seat

Bob McCarty
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Re: Carb Leaking Gas

Postby Bob McCarty » Tue Jul 19, 2022 2:50 pm

If it's leaking after the sediment bowl valve is closed, there is probably debris keeping the valve seat from completely closing.
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RedFred
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Re: Carb Leaking Gas

Postby RedFred » Tue Jul 19, 2022 3:37 pm

Where is it leaking?
Image

Eugene
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Re: Carb Leaking Gas

Postby Eugene » Tue Jul 19, 2022 3:53 pm

RedFred wrote:Where is it leaking?
Dripping out the carburetor after fuel shut off at tank. Indicates two problem areas. Shut off valve and needle valve/seat.
I have an excuse. CRS.

staninlowerAL
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Re: Carb Leaking Gas

Postby staninlowerAL » Tue Jul 19, 2022 4:15 pm

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:
Vlave+1.JPG
Stan in LA (lower AL)
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lititzdoug
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Re: Carb Leaking Gas

Postby lititzdoug » Wed Jul 20, 2022 5:41 am

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
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Re: Carb Leaking Gas

Postby Stanton » Wed Jul 20, 2022 6:55 am

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…
Stanton
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CharlieK
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Re: Carb Leaking Gas

Postby CharlieK » Wed Jul 20, 2022 9:38 am

thanks Stanton
get er done; life is good

lititzdoug
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Re: Carb Leaking Gas

Postby lititzdoug » Thu Jul 21, 2022 8:14 am

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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