Over the years there have been a number of efforts to build a better mousetrap in the “float switch” department. Obviously switches that rely on an actual physical float are prone to some problems over time, and those relying on a drop of mercury in the switch are environmentally sketchy as well. See Water Inc. has come up with a new solid state switch that is particularly notable in differentiating between water and fuel or oil in the bilge. With possibly large fines for such spills these days, it makes sense to take some precautions like replacing old fuel lines and making sure your fueling routine is basically spill-proof. However, if an old line ruptures, or you have a messy oil change, your dutiful bilge pump may enthusiastically pump the offending fluids overboard. This switch detects the difference between water and hydrocarbons and stops pumping when it detects the troublemakers. It also incorporates some microprocessor smarts so that when emptying water from the bilge, it’ll pump for a few seconds after it no longer sees water, thereby clearing the line so that you don’t get so much of a residual puddle. It’s a new product, so I haven’t seen any reviews on it yet, but it looks promising.

Link: See Water Inc. Bilge Pump