internal fuel tank question

[rattlsnak]

A friend has a 2011 TT and claims his fuel gauge is not reading properly. We have taken both covers off and can move the floats around it seems to respond normally.This is the newer design that only has one fuel pump on the passenger side. I would think that the fuel level goes down equally on both sides (shared upper region) and then when it gets to the separation/split point, should the fuel level go down equally on each side or should the drivers side go down first and then the passenger side? He thinks they should go down equally but I am leaning towards not because the only device in the drivers side is the jet/suction pump and I think its sole purpose is to get fuel from the left side and push it into the right side pump area. That is how an airplane works so I could be totally wrong! Anybody know for sure how it is supposed to work? Right now, the drivers side is empty and the passenger side had 1/2 or so. Is the jet pump from the right side supposed to push fuel over to keep it balanced all the way down or is it supposed to drain one side down first?