Water accumulates in a fuel system in several ways, condensation, contaminated storage tanks, it's even drawn out of the atmosphere during fueling. Most people do not consider water to be a problem except during the winter months. This is incorrect thinking. Water causes problems all year long and the damage it brings about during the course of the year can be far worse than what little damage is done by winter freeze up. Water can score or split your injectors because it does not compress going through your injectors like fuel does.
Water also has no lubricating ability and washes away existing lubrication.
In diesel and gasoline water promotes the growth of algae and in diesel fuel waters aids in the forming of sulfuric acid, both very costly problems. For water and miccrobial testing see our line of fuel testing equipment and our Fuel Tools page. We have everything you need to sample your tanks, fuel and filters. When fuel is refined all water is removed but in the transporting of fuel through the pipeline or from one tank to another, water accumulates. Fall and spring are the worst time for water build up with the warm days and cold nights causing fuel tanks to sweat.