yep, Ron is right, you need to put a "T" in the vent line between the check valve and tank, then run the line where you can get to it easy, maybe put a fuel dot on the end of it ande make it look cool[8D]
just unplug the dot when your ready to fuel and it will vent the tank

here is a link to the dots i use!!

http://www.pspmfg.com/FuelDotsRegular.html