On ebay JS Brown or 521 Restorations sells the one that will work. His listing has a diagram of the separator. There are ones being sold that the vapor return size hole is to large and this allows gas to run back to the tank instead of vapor. I do know people that block the tube off which does eliminate the issue on the bad ones.
They are suppose to be a return line, the system is suppose to work so that if you return fuel from a .060 line, it wont stay stagnant,heat up and vapor lock. when the extra supply is needed at the carb, it is easier to travel thru a 3/8 line than a .060, once the needle closes or cycles, it becomes a return line again. same as a modern fuel system. if the hole is too big, it will starve the carb.
Duane
