Which of the following statements regarding aviation fuel is true?

The correct answer regarding aviation fuel is that temperature variations can indeed cause moisture or water to accumulate in fuel. This phenomenon occurs due to condensation, which can happen when fuel is subjected to temperature changes. As temperatures drop, the air within a fuel tank contracts, leading to the moisture in the air being drawn into the fuel. Conversely, when temperatures rise again, the moisture accumulates, potentially creating water at the bottom of the tank where it can mix with the fuel, adversely affecting its properties and performance.

Understanding the impact of temperature on fuel storage is crucial for maintaining fuel quality and ensuring the safe operation of aircraft. Pilots and maintenance personnel must regularly check and filter fuel to remove any accumulated water, which can harm the engine if not addressed.

The other statements, while they may contain elements of truth, do not accurately reflect the realities of aviation fluid management. Storing fuel for long periods can degrade its quality, agitation doesn’t guarantee quick separation of water, and filtering fuel from sealed drums is a critical step to ensure that no contaminants, including any potential water, are introduced during use.