Where should auxiliary tanks be located relative to the supply tank from which they are filled?

Auxiliary tanks should be located at a level above the supply tank from which they are filled. This positioning allows gravity to assist in the flow of oil from the auxiliary tank to the supply tank, ensuring a more efficient transfer process. When the auxiliary tank is elevated, it can supply fuel more effectively due to the natural downward force of gravity, which helps prevent issues like air locks or siphoning that could occur if the tanks were positioned at the same level or if the auxiliary tank were below the supply tank. This arrangement is crucial for maintaining proper fuel flow and system operation.

If auxiliary tanks were placed below the supply tank, they would rely on pumps to move fuel, which could increase complexity and the risk of mechanical failure. Similarly, positioning them at the same level might also hinder effective fuel transfer, as gravity's ability to assist would be negated. Therefore, placing auxiliary tanks above the supply tank is a best practice in oil fuel systems.