This document discusses fuel contamination issues caused by increasing biodiesel content in diesel fuels. Biodiesel is more hygroscopic and decays faster than conventional diesel, increasing risks of water accumulation, microbial growth, and other contaminants. Strict fuel housekeeping practices like regular polishing are recommended to remove contaminants and maintain fuel quality for backup generators. Fuel polishing systems automatically filter and clean stored fuel, helping to prevent generator failures during emergencies. WASP is a leading UK manufacturer of fuel polishing equipment with over 20 years of experience designing systems to maximize fuel quality and protection.