Almost sounds like you have the wrong carburetor (or it is missing pieces). The one that is vertical is your drain. The other one that comes out of the horizontal "tube" should have a needle valve (per your drawing) in it and is NOT a drain. If it is plugged then it means some one removed the needle valve b/c it leaked or the carb you are using is for something like a power unit that has a fixed main jet (as opposed to adjustable) although usually the latter case wouldn't have a hole there at all.
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