As diesel fuel warms through engine use or the daily heat of the sun, its natural capacity to absorb water increases, dissolving and dispersing a percentage of any water in the tank. When the fuel cools, this dissolved water desorbs into a bacteria harboring emulsified suspension. By flowing the fuel gently over many hours, the FPM maximizes your filter's ability to separate this difficult to remove emulsion and filter out particles. Features: Power requirements less than 2 watts Internal pressure drop less than 0.5 psi Voltage requirements 10-16 VDC, 12 VDC nominal Approximate Dimensions (Body): 3.8" L x 2.47" H x 2.14" D Acceptable Fuels diesel, biodiesel, kerosene Includes 18 AWG leads