ORIGINAL: rcpattern
Exactly. You want to let air in the tank, but not out. If you use the check valve, you will need to clamp the fuel line after each flight to prevent it from flooding.
Arch
I guess I didn't realize the current fuel delivery system on YS floods so easily. My last experience with YS was 8 or 9 years ago where one wanted a pressurized tank.
Have never flooded the Webra because of pressure build up in the tank in the hottest Florida days.
On a gas engine with the walbro carb, it's non-sequiter
Matt