Filter bowl drain oddity

[Brad B]

While replacing my filter bowl and fuel pump this weekend, couldn't resist tearing a part the old stuff to see how it all works. Can anyone tell me why there are two hole leading out of the filter bowl into the shaft for the water drain? One above the other. Bottom one seems to be the main drain hole but the one above it doesn't seem to lead anywhere once it hits the valve shaft.

 

[COMPOSER]

might be a vent hole since you open it before removing the lid.

 

[Brad B]

You don't have to open it before opening the lid. At least I don't. The hole in the shaft leads no where, that's why I thought it was odd.