The Ford Barn

Keebs · 07-28-2022, 07:34 PM

My Zenith 2 carb is leaking gas from the main bolt. It's not huge, but a constant drip. The float is correct and there is no gas leaking from intake.
Any Suggestions?
Thanks, Keebs

Brentwood Bob · 07-28-2022, 07:43 PM

I have found a crack in the casting between the fuel bowl and the center bolt hole. You may need a replacement bottom casting. I have several.

Gary WA · 07-28-2022, 08:34 PM

http://www.model-a.org/ thanks to supplier of site.good info.

Rob Doe · 07-29-2022, 04:29 AM

Quote:

Originally Posted by Keebs

My Zenith 2 carb is leaking gas from the main bolt. It's not huge, but a constant drip. The float is correct and there is no gas leaking from intake.
Any Suggestions?
Thanks, Keebs

Keebs, my Zenith was dripping underneath and had internal issues. Turned out, there is a 1/16" hole in the bottom of the intake / air horn that allows fuel to run to lowest points and drip off the drain plug and the main bolt area. Some over tighten the drain plug until it strips the threads. Luckily, I read about the tiny hole here on the forum and didn't make that mistake. In my case, the jets were leaking at their bases inside the intake.

Rob Doe · 07-29-2022, 04:31 AM

deleted double post

Bob Bidonde · 07-29-2022, 08:56 AM

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Ditto Rob's suggestion.

Terry, NJ · 07-31-2022, 09:54 AM

Quote:

Originally Posted by Bob Bidonde

Ditto Rob's suggestion.

Bob, Thanks for this illustration of float, gas levels and the heights of the jets. It's a great dwg. that really shows exactly what's going on and how leaks occur.
Terry

jdpalmer · 07-31-2022, 09:12 PM

mine was leaking because float valve was not holding and it appeared to be leaking around the bolt on the bottom but it doesn't have any gas in its hole to leak. mine was coming from overflow hole in the motor side of the carburetor witch is about 1/8 th inch one the backside.

Tom Endy · 08-01-2022, 12:23 AM

I suspect the fuel is coming out of the little drain hole at the bottom of the bottom casting and running back and dripping off the bolt. Stick your finger in through the air intake below the choke and see if it is wet with fuel on the bottom. If so, it is coming from the float valve not holding or not set correctly.

Tom Endy

07-28-2022, 07:34 PM	#1
Keebs Junior Member Join Date: Feb 2022 Posts: 1	Zenith 2 carb My Zenith 2 carb is leaking gas from the main bolt. It's not huge, but a constant drip. The float is correct and there is no gas leaking from intake. Any Suggestions? Thanks, Keebs

07-28-2022, 07:43 PM	#2
Brentwood Bob Senior Member Join Date: May 2010 Location: brentwood, ca Posts: 4,247	Re: Zenith 2 carb I have found a crack in the casting between the fuel bowl and the center bolt hole. You may need a replacement bottom casting. I have several.

07-28-2022, 08:34 PM	#3
Gary WA Senior Member Join Date: May 2010 Location: Clinton,WA/Whidbey Island Posts: 4,106	Re: Zenith 2 carb http://www.model-a.org/ thanks to supplier of site.good info. __________________ www.whidbeymodelaclub.com

07-29-2022, 04:31 AM	#5
Rob Doe Senior Member Join Date: Apr 2021 Location: Central Illinois Posts: 496	Re: Zenith 2 carb deleted double post __________________ "It ain't what you know for certain that gets ya in trouble. It's what ya know for certain that just ain't so!"

07-31-2022, 09:12 PM	#8
jdpalmer Senior Member Join Date: May 2010 Location: Dublin, Virginia Posts: 191	Re: Zenith 2 carb mine was leaking because float valve was not holding and it appeared to be leaking around the bolt on the bottom but it doesn't have any gas in its hole to leak. mine was coming from overflow hole in the motor side of the carburetor witch is about 1/8 th inch one the backside. __________________ Jimmy Palmer

08-01-2022, 12:23 AM	#9
Tom Endy Senior Member Join Date: May 2010 Location: Southern California Posts: 3,131	Re: Zenith 2 carb I suspect the fuel is coming out of the little drain hole at the bottom of the bottom casting and running back and dripping off the bolt. Stick your finger in through the air intake below the choke and see if it is wet with fuel on the bottom. If so, it is coming from the float valve not holding or not set correctly. Tom Endy