Final answer:
The question is about a tail tank system that includes multiple tanks with different fuel pumping mechanisms, relevant to engineering and fuel management in vehicles.
Step-by-step explanation:
The question refers to a tail tank system which is an engineering concept used in various technologies, such as aerospace and automotive applications. This system typically comprises multiple tanks that can be filled simultaneously through a common manifold or sump. It may utilize different kinds of pumps, including electric fuel pumps and engine-driven fuel pumps, to supply fuel or other fluids. Additionally, some tanks may use gravity feed mechanisms to move the fluid. In the context of this question, these concepts could be related to fuel systems in vehicles, such as the Toyota Fuel Cell Hybrid Vehicle, which have to manage fuel efficiently and safely to power different types of engines or energy conversion devices.