What is diesel fuel? What is fuel polishing? How long can I store diesel fuel? What is diesel fuel lubricity? How does water get into diesel fuel and what problems can it cause? Most Frequently Asked Questions on Microbial Growth in Fuel  What are Micro Organisms or Bugs? What do these bugs do? Do they pose a threat to my equipment? Can contaminated fuel be treated? What causes microbial contamination in fuels? Where does this contamination originate? Can the presence of these organisms be detected? Where is the best place to take a fuel sample?  How often should fuel be sampled? Should new fuels be sampled? What products are susceptible to contamination?