somthing like this would be good for you
http://www2.towerhobbies.com/cgi-bin...?&I=LXD745&P=0

it goes on the fuel line in between the carb and the tank. just mount it to a fuse panel outside the craft. just make sure it stays clean. some dirt in the filler will start to leak (this is the number one complaint about these and it is almost always dirt inside the seal.)