Wow, what precision. I too read the article on the RC magazine using double clunks and a separate fill line. I could see no advantage except for the use of a check valve in the pressure line. That would ensure pressure stays in the tank at all times and ensures a positive feed - sort of a close circuit set up - no venting back through the muffler at low RPM states.

It sort of reminds me of the YS set up.

Cheers,

Chip