leaking carb

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nbsbbaker
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leaking carb

Postby nbsbbaker » Tue Apr 09, 2019 9:59 pm

I recently purchased and installed a new carb (China built, assembled in US) for my 51 cub. I put it on and soon after I opened the fuel line from the gas tank (engine not running) gas began dripping from the bottom of the carb. Since this is a new carb I am assuming the guts were assembled correctly but it sure seems that the needle is not seating properly. I really do not want to take this new carb apart but will if I have to. Is there any other reason fuel would leak from the bottom of the carb with the engine off?

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Glen
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Re: leaking carb

Postby Glen » Tue Apr 09, 2019 10:54 pm

Hi,
People on here have said that some of the replacement carburetors need the float level set correctly. If the carb has no dirt in the needle and seat, it may need the float level set.

Below is a page from the Cub service manual showing the float level.
You have to remove the top half of the carb, and turn it upside down, like the pic of the Zenith carb, at the lower right of the page.
Be sure to use the IH carb specs, if it is an IH style carb.

http://www.farmallcub.info/manuals/gss- ... 002-09.jpg

Check the float drop also, it is shown in the pic.
Pull the halves of the carb straight apart for 4", don't twist them apart. There is a small idle tube that screws into the top half, and sticks into the bottom half, it is easy to break.
Tighten everything on the carb gently, the metal is soft, and threads can strip. :)

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Stanton
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Re: leaking carb

Postby Stanton » Wed Apr 10, 2019 6:38 am

There are several helpful threads in the How To Forum under Fuel that can step you through any fuel-related issue: http://www.farmallcub.com/phpBB2/viewforum.php?f=139
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nbsbbaker
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Re: leaking carb

Postby nbsbbaker » Wed Apr 10, 2019 8:08 am

Thanks for the response. I was hoping not to have to take the carb apart but I may have to.


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