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Old 06-03-2010, 01:44 PM   #48
David Cockey
Junior Member
 
Join Date: May 2010
Location: Southeast Michigan
Posts: 19
Default Re: For vapor lock nonbelievers

Discussion is good.

I just had a look at a carburetor without the added hole in bowl. There is a vent hole in the carburetor TOP near the float bracket which goes from the bowl to above the vent hole in the carburetor bottom. That area is vented to the atmosphere through the hole in the carburetor bottom.

Thanks for the note which prompted me to have another look at the carburetor. I found it hard to believe that leakage past the gasket was sufficient but didn't see the other vent the first time I looked.

So Model A carburetors initially had one vent from the bowl to the carburetor, and then a second vent was added around May 1930.
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