Abstract: Removal of a first liquid, such as water, from a tank containing a second liquid of lower specific gravity, such as diesel fuel, is achieved with a liquid trap chamber into which the first liquid is delivered by a primer wick and from which the first liquid is withdrawn by an exhaust wick or pump. The primer wick transversely fills an in-flow passage above a downward-facing inlet opening of that passage. The first liquid is drawn from the tank by the primer wick, which spills that liquid over a weir into the liquid trap chamber. The bottom of the liquid trap chamber is disposed at a level below said inlet opening. The exhaust wick is disposed to transversely fill an outlet passage disposed above the liquid trap chamber with the bottom of the exhaust wick or pump sensor positioned at least as high as the top of the primer wick.