Day tanks are fuel containment systems designed for installation in close-proximity to an engine to provide a reliable supply of diesel fuel. They are often mandatory when the engine-mounted fuel pump is unable to draw fuel from a remote-mounted fuel tank due to distance or elevation issues.
For safety and reliability, these fuel systems are configured as suction-type, meaning that the day tank draws fuel from the main tank, and the engine draws fuel from the day tank.

Rezervor de alimentare zilnică/de serviciu vs rezervorul principal/de stocare.