That should be just a vent I believe. In your first picture it's just an open connection. The line just below that with the filter in it goes to the fuel pump.
This makes no sense to me...there are no vent lines on the carb are there?
I know mine is a few years older but do me a favor and look down the pasenge side of the block to see if there is a nipple on the fuel pump where that hose should go
