REFLECTOR: Fuel Vapor Release Valve

[Brian Michalk]

I am trying to find a valve that will allow a fuel tank to vent vapor, 
but not vent fuel.

This is for my header tank which receives the return fuel from the fuel 
pressure regulator.  Occasionally, it will vent fuel overboard.

I have seen large valves for racing that allow them to quickly fill fuel 
tanks, on the order of 1 inch diameter, but I'm looking for something a 
lot smaller.  This valve has a float in it that closes when the fuel 
reaches it.  Some airplanes also use this valve on wing tanks, but I'm 
not having luck stumbling across the proper term for searching on that.

Anyone have any pointers?