Re: Ken's 1937 120 Touring Sedan

Posted by Owen_Dyneto On 2016/5/15 16:09:46

Intake manifold drain valve. Used on many makes and models up until about WW II. The idea was to drain away excess raw gasoline from the manifold such as might accumulate during over-choking, excess mixture, etc. There should be a ball check valve at the bottom such that with the engine not running, the valve is open but when running manifold vacuum pulls the ball up and closes the valve. If it's not working then you will have a constant vacuum leak.

Honestly, unless you want it because it belongs there and can fix it if needed, you can remove it and plug the fitting - as was done a couple of years later.