S-10 inverted fuel

[RansS10Aerobat]

Hi: Someone who is flying the S-10 or S-9 with the inverted fuel header tank.... How does the tank work when inverted? I know that the flop tube goes to the top and the pump draws fuel from the header tank: but (1) how does the header tank vent when inverted? (2) does it draw more fuel from a wing tank when inverted? (3) does it leak fuel back to the wing tank when inverted? (4) do the wing tanks lose fuel through the vents when inverted? (5) how much time of continuous one-g inverted flight can you get? Thanks. == George