As a boater all my life with circumnavigation experience I do know the importance of a clean tank and fuel. I clean every tank as if it was mine and using the vessel offshore. The same work ethic applies to stand by generators and fuel storage tanks. Imagine this…A hospital generator fails after the main electrical power goes out and you are in the middle of major surgery. This is an extreme example but probable with dirty tanks and fuel. Such is true for any of our first responders: police, fire trucks and any emergency situation.