ok have a question on a tank setup on how it works. Well i realize there is a line for pressure and one for feed fuel to the carb. i have a lancair and it has to vent lines on the tank one feed line and a gas plane that is the same way. except of course the gas plane doesnt use a pressure tap for the tank fuel is drawn from the tank buy the vaccum of the carb.

But anyway on the lancair what is the second vent line for wish i could draw it. i think i will try may not be very good but may give an idea if it is visiable. should i cap this third vent line or is it for fueling the tank. thae lancair is a cmpro lancair not greatplanes.

on the gas plane the issue is fuel running out of the vent line i have one plugged and the other of course open to the air on the bottom of the plane but fuel tend to spill out of it. most likely a normal occurance.