Aeronautical Fuel System

Consists of :

Tanks: containing Aeronautical Fuel, located in the wings or fuselage. Equipped with a float to inform the pilot of the fuel level.
Selector valve: allows the pilot to choose the tanks to be used.
Decanter Filter: allows purging at the low point of the engine.
Auxiliary Electric Pump: emergency pump to replace the main pump, used as a preventive measure during take-off and landing, when the diagnosis of a main pump failure is impossible.
Mechanical Pump: main pump supplying the engine.
Pressure Indicator: provides information on the pressure in the system. A drop in pressure can occur in certain cases: empty tank, closed valve, broken mechanical pump, indicator out of order. In the event of a drop in pressure, the electric pump should be switched on immediately and the tank changed.

Notes

High wing aircraft do not have a pump, and are gravity fed.
During the pre-flight inspection, the fuel level is checked.
During the flight, the tanks are changed every 30 minutes to balance the tanks, and the fuselage tanks are emptied first.