How much fuel must be recirculated based on the amount in the hoses?

The correct choice indicates that the amount of fuel that must be recirculated is twice the amount in the installed hoses. This is a crucial aspect of managing fuel systems, especially in tactical or bulk fuel operations, where maintaining fuel quality and preventing contamination are vital.

When fuel is drawn from hoses, it is essential to recirculate an equivalent amount of fuel back into the system to ensure that any fuel in transit is consistently refreshed and doesn't stagnate. By recirculating twice the amount in the hoses, the system effectively promotes thorough mixing and circulation, which helps in minimizing the risk of issues like phase separation, sediment accumulation, and other quality-related problems.

Moreover, the principle of recirculation also allows for any potential contaminants or debris that may have entered the system from the hoses to be removed from circulation, thus safeguarding the integrity of the fuel stored in tanks.

This approach aligns well with best practices in fuel handling and management, ensuring operational efficiency and the longevity of the fuel and equipment used.