Yes 87suzi is right.
this tube is not connected to anything, it a vent & excess oil on the back side of the pump diaphram is draining here.
it could be time for a new fuel pump. also check to see if your PVC valve is working correctly, if bad, it could be forcing oil out here.
Note, if you replace pump, be aware that there is a small push rod that is in the side of the head to work the fuel pump
lever, don't let it fall out or your new pump won't work.
CAPT