Just playing devil`s advocate <img src="/forums/images/graemlins/evil.gif" alt="" />, but the pump intake is on the bottom of the tank anyway,,,,it doesnt magicly float on top of the fuel, and when the tank is half or even quarter full,,,all the dirt and stuff will float around in suspension just from stoping ,starting and turning.if the engineers wanted to be serious about the whole thing then they would put a tank inspection drain on it like they do on airplanes,,,,then you could also get rid of water and crud in tank.but then again when your engine dies on the road , just pull over,,,in the air you now have a forced landing.