Water can form in any fuel tank, typically from condensation, poor ventilation or water ingress (especially common in marine vessels). Water, while a contamination itself, is the main cause of formation of all other forms of contaminations, such as bacteria, yeast and moulds. Infections then quickly multiply and can lead to blocked fuel filters, damaged injectors, engine failure and can be potentially life threatening if back up power supplies fail. We therefore recommend fuel is checked regularly for signs of contamination so any infection can be treated early on. To prevent and/or treat infection, we recommend one of our Biocide treatments.