Definition

An aircraft fuel system enables the fuel to be loaded, stored, managed, and delivered to the engine(s) of the aircraft.

General Description

Fuel systems differ greatly due to the varied size and complexity of different aircraft. In the most basic form, a fuel system will consist of a single gravity-feed fuel tank with an associated fuel line connecting it to the engine. In larger aircraft, the fuel system is likely to involve multiple fuel tanks, which may be located in the wing or the fuselage or both. Fuel systems normally use a primary engine-driven pump, which may be connected in parallel with an electrical pump. The electrical boost pump can serve as a backup in case of failure of the engine-driven pump. Electrical pumps and associated valves may also allow for refueling and defueling, and in some applications, fuel transfer to maintain proper aircraft centre of gravity.