Just bought an center console boat, forgot to ask salesman where the gas fuel vent is. The gas tank is under the center console. I see the inlet to the tank then another small tube that runs back up to where you pump gas into. Do I need to open any vents when filling gas or keep it open? Other portables gas tank there is a vent you keep open so it doesn't build up in tank. Not sure on this one. Any help is appreciated.