I would have much rather gone with a GTX fuel tank to keep everything OEM style, but I wasn't sure if it would fit, and they weren't the easiest to find. I would have kept my center of gravity way lower & between the wheels, and the tank in a good safe spot.
IMO... Keep the stock tank.
On my fuel cell - it has 3 connections - fuel pickup (tube to bottom) fuel return, and vent/rollover valve. It does take fuel from the bottom of the tank.