Yep, popcorn time. Here we go again....
My two cents: I've never used a loop in the vent line in over 40 years of flying, and never had fuel "siphoning" problems. But that's just me.... The only time I get "crud" on my airplane is if I have my smoke system set up to pump too much smoke oil.
And BTW, as far as maneuvers, if my airplanes spend more than 10 seconds straight and level, it's because I am coming in for a landing or trying to chase a fly away from my face while flying...
I'm outta here!
AV8TOR