Experienced boat owners know certain kinds of fuel-related problems do exist and come with the territory - they may even be viewed as inevitable in marine diesel fuel. Some users simply put up with these issues while other watercraft owners fight back through the use of fuel treatments like Bell Performance MARINE DEE-ZOL.
Marine diesel fuels, whether ethanol-blended gasoline or marine diesel fuel, have the same kind of issues that non-marine, on-road fuels have. Yet the unique nature of the marine environment means some of these problems are amplified.
The humid marine environment is a perfect setting for water to condense in vented fuel tanks, where it collects and sinks to the bottom of the tank.
In diesel fuel, this water buildup promotes oxidation and fuel breakdown. And since diesel fuels tend to be stored longer (if your marina stores diesel fuel for use by multiple boats), bacterial and fungal growth is always a possibility when water is present. Once bacteria and other microbes establish a foothold, they are impossible to get rid of without a biocide, and lead to further diesel problems including quality breakdown, corrosion of tanks, deposit buildup and nasty filter plugging problems.