Nice Shots Mola ,thanks,

Arch, I never defuel My airplane, I fly till dark mostly and can`t see when it`s time to pick up,
I also I carry my airplanes in my XC90 Volvo, They rest on a carpet backed folded seat setup so,
I don`t wan`t to have any leakage,dripping from the tank, vent lines EXC My wife would not like smelling cool power air freshener

If you have a just a vent ,it leaks a little all the time during flying, at rest from carrying the airplane ECT,you have to worry everytime about rolling the airplane over to check the engine ,roll back drip ,drip, ,ECT but with the check valve setup,I rarely have to clean the engine compartment. it stays clean.
Also if you have a two stage paint job like in Japan the paint is not fuel proof so any leaking from this area will crawl under the exit,,painting area ,and ruin the paint,, thats why guys are so carfull about this set up.
All of the paint in mold composite fuse paints will discolor a little with 30% nitro.as well if not cleaned ASAP.

A professional, leak free ,fuel setup makes a engine compartment tunnel area leak free ,and there is no chance for a ruined paint job
If done right you can eat off of the pipe mount,engine compartment area after 20 flights


It`s Just like if the engine is tuned correctly you can fly 10 flights and have almost nothing to wipe off the bottom of the airplane ,,,and pick up fuel economy to boot..so it`s about perfectionism really!

The only down side is you have to be carfull in the heat ,, a little clamp is all you need or remove your fuel dot from the exit in the vent line and put it in the fuel line while the airplane sets on the line ,,,then it`s vented like your system.
It`s the way I set all my airplanes up But,your way works ok too.
Bryan