🔍 Key Concepts

• Microbial contamination in fuel tanks (what it is and where it grows) • Purpose of chemical additives used in fuel storage systems • Difference between general salts/waxes and targeted fuel treatment chemicals

💭 Think About

• Which option is specifically designed to kill or control bacteria and fungi in fuel, rather than just change physical properties of the fuel? • Think about what chemicals are actually added to diesel or bunker fuel during tank cleaning or when dealing with ‘diesel bug.’ • Which choices are more about corrosion/scale or solid deposits, and which one is meant to directly attack living organisms?

✅ Before You Answer

• Identify which choice refers to a chemical that kills microorganisms, not just modifies fuel properties. • Eliminate any substances that would not dissolve or disperse well in fuel or would create more contamination problems. • Consider what is commonly recommended in fuel maintenance programs and engine manufacturer guidelines for treating microbial growth.