1972 Plymouth Fury III Gasoline Tank Vent Leak

The gas tank on my 1972 Plymouth Fury III has 4 vents on it and one of them seeps gasoline when above 3/4 full. The leak is coming from the base of the vent, and it feels as though there is a little play in the vent. Has anyone tried the J-B Weld TankWeld epoxy putty on a similar problem, and if so did it really work.
Author: CbodyMA