In fuel systems, what does the term 'light tank' refer to?

In fuel systems, the term 'light tank' refers to a tank that receives fuel during imbalance situations. This concept is part of an aircraft's fuel management system where fuel can be transferred between various tanks to maintain proper balance and ensure optimal performance. During flight, if one tank becomes heavier due to fuel distribution, the light tank can receive fuel to address this imbalance, promoting more efficient flight handling and stability.

Understanding the role of the light tank in fuel management is crucial as it shows how aircraft systems strive to keep the aircraft balanced while optimizing fuel usage. Such systems are designed to make the aircraft operate more efficiently and safely. The other options do not accurately describe the function of a light tank in fuel systems, which is primarily about managing fuel balance rather than general fuel quantity or pressure.