What precaution is necessary for a gravity feed fuel system that supplies fuel from multiple tanks?

In a gravity feed fuel system that supplies fuel from multiple tanks, it is essential for the tanks to have interconnecting airspaces. This design allows air to replace the volume of fuel being drawn from the tanks as it is consumed. When fuel is used, the level in the tank decreases, and without an airspace to equalize pressure, a vacuum could form, potentially impeding fuel flow. Interconnecting airspaces help ensure that fuel can flow consistently, facilitating the proper function of the gravity-fed system.

Moreover, the design prevents problems related to fuel starvation and ensures that the system operates smoothly as fuel is drawn from the tanks. If the tanks did not have interconnecting airspaces, the system could become inefficient or even inoperable if an air lock were to occur. Thus, interconnecting airspaces are a critical feature in maintaining the reliability and performance of a gravity feed fuel system in aircraft.