66 C10 Carb question?

[Prflyer1]

I am somewhat clueless about Carbs, while cleaning the engine bay and engine I thought I had broken a line to the carb. I believe its the original Rochester Carb, the line in question in the picture was attached by a rubber type union or cover. Today when I got the engine ready I started and ran it for a while with absolutely nothing wrong, no gasoline coming out either side of the line. Is this some kind of breather line? or a line that was eliminated for some reason? any help will be appreciated, apologies for the bad pictures.