Just run a line from there to the pulse fitting on a mikuni pump, install the mikuni pump between the tank and the carb and you're all set! The pulse line provides a vacuum / pressure oscillating signal to the diaphragm in the mikuni pump to move the fuel. As long as your crank seals are good this should work great. Use a pump like this:
http://cgi.ebay.ca/Mikuni-Fuel-Pump-...3A1|240%3A1318
Or any similar single in / single out mikuni pump
A lot of stock golf cart pumps will work