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lorenallen · 05-14-2018, 06:36 PM

I have a 1931 Model A with a Zenith carburetor which leaks gas even with the manual valve shut off. I have changed many parts and I have cleaned the carburetor and had a good Model A mechanic look at it but it still leaks. It has to sit for a few hours to start leaking. I have changed all gaskets, The float valve (4 times), the float and shaft, the cap jet and main gets, and the main drain plug. Today I removed the carburetor and opened it up. I placed the lower halve in the vice and filled the gas in the bowl to about the level it would run at. after an hour gas was present on the top of the casting lip and after 3 hours the gas level dropped 1/2 inch in the bowl. The only place the gas accumulated was on the top edge of the casting and it eventually ran down the outside of the casting. I don't understand how this can happen - anyone have any ideas. Thank you for your response ahead of time.

05-14-2018, 06:36 PM	#1
lorenallen Junior Member Join Date: May 2018 Posts: 20	Model A Zenith Carburetor I have a 1931 Model A with a Zenith carburetor which leaks gas even with the manual valve shut off. I have changed many parts and I have cleaned the carburetor and had a good Model A mechanic look at it but it still leaks. It has to sit for a few hours to start leaking. I have changed all gaskets, The float valve (4 times), the float and shaft, the cap jet and main gets, and the main drain plug. Today I removed the carburetor and opened it up. I placed the lower halve in the vice and filled the gas in the bowl to about the level it would run at. after an hour gas was present on the top of the casting lip and after 3 hours the gas level dropped 1/2 inch in the bowl. The only place the gas accumulated was on the top edge of the casting and it eventually ran down the outside of the casting. I don't understand how this can happen - anyone have any ideas. Thank you for your response ahead of time.