> I need to incorporate  check  valves in the tips for the fuel vents...

Hello Mark,

I have an e-glass 320 with fuel out to the tips. I have no check valve in
the vent and can't figure out why you want one. I have experienced no
problems in 350 hours. Why do you want a check valve?

Bill
harrelson@erols.com
N5ZQ  LNC2  O-320   VA42