Although water attraction can occur within the fuel tank at any time, when diesel fuel is stored for long periods, it is more likely to draw in moisture from the air. This growth can lead to a gummy mess within your fuel tank — clogging the entire system, and if not properly cleaned and maintained, causing your diesel engine to run poorly, if at all.
Diesel STA-BIL® demulsifies the water (breaks the water into small droplets) dropping it to the bottom of the fuel tank, where the fuel/water separators remove the water from the fuel, allowing the fuel to move safely through the fuel system. By removing the water before the fuel flows through the fuel system, also helps protect against corrosion.