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1. Even though this does not appear to be similar to what I once experienced, "if" the metal tube exiting the top of the filler cap were larger; and,
2. "If" a hose were provided and attached from the top of the tube exiting the top of the filler cap ........ to a horizontal tube provided adjacent to the choke plate on the carburetor ..... while the engine is running, the suction from the carburetor would withdraw smokey blow-by fumes from the crank case and recycle them through the carburetor and out to the rear of the exhaust pipe.
3. Saw this done once by my professional mechanic & inventor Uncle with a 1/2" copper tube on his "new" Model B marine engine provided in his 1932 racing boat.