Quote Originally Posted by johnb View Post
If the tank is a wing tank with a large surface area, minor differences in fuel fill levels over a large area can result in significant fuel volume deltas.


So how do you know how much fuel you have in the plane? I seriously doubt that it is a significant amount if you fill both wings to the top of the filler.

When you adjust the needle valve to 10 GPH what are you using to measure it?