| I'm not familiar with the Legacy check valves. If you are using the Andair ones, obviously the arrow has to point to the tank. I had mine apart for testing. What's inside is an arrangement that switches (when there is an outword pressure) from about 8 biggish holes for air passing into the tank to two tiny holes for letting fuel out for expansion. The tiny holes are enough to make a noticeable dribble but not much more. You need them also for air in the tank to expand if you are climbing aggressively. (Actually my tests said they need to be about twice as big to accomodate a 50 gallon tank going to 20,000 feet in 10 minutes).
The other bit is how you route the vent line once it leaves the tank. You would like it to go to the highest possible point on the wingtip to improve your changes of being above the fuel. On a IV I would put the check valve up there too (or just slightly on the tank side of the highest point). Not sure what considerations there are for a legacy. On Jan 31, 2012, at 3:30 PM, Bill Bradburry wrote: I am concerned that the fuel vent check valves may be installed backwards or are leaking. The fuel tanks seem to vent ok and I have not seen any problems along those lines, but fuel runs out of the vents in the wing tips any time I get much over a half to three quarters of a tank. Anyone else having this problem or have advice? Bill B |