[caltitan]

Yes, if the sediment gets stirred up and sucked into the pumps then the filters should trap most of it (a clogged dispenser filter would slow it's pumping rate down). And yes, I would worry about water too (and the microbes that live in the water and degrade the quality of the fuel), but if there is water in the storage tank, it can make it's way to your vehicle without need of any turbulence caused by a fuel drop. Water settles at the bottom of the storage tank (lighter than gasoline) and the pump is located near the bottom so that when the tank is low it can still pump fuel out of it. Generally, if you ever question the quality of fuel you may be getting at a station, do not return there for fuel.