Hey guys My A4 always "run out of fuel" at half a tank even when there was actually half a tank of fuel. My in tank fuel pump failed and on getting a second hand pump (whole thing) it has literally just run out at 1/4 of a tank. Can anyone explain this? Is it possible that something that lifts fuel from the other side of the tank, as it's a Quattro has failed maybe? Would really appreciate any help. Many thanks.