Small Multi-Engine Aircraft Fuel Systems
The diagram in figure 1.4 shows a typical fuel system for a twin-engine airplane using an RSA fuel injection system. This fuel injection system does not return fuel to the tank like the system we have just discussed.
Each wing has two fuel tanks that are connected together and sense as a single tank, and the selector valves allow either engine to operate from the tanks in either wring. From the selector valve, the fuel flows to the fuel filter and then to the electric fuel pump, on to the engine-driven pump, into the fuel injection system and to the cylinders.
The instrumentation for this system consists of the fuel quantity, fuel pressure, and fuel flow gauges. The fuel quantity gauges show the total amount of fuel in the two tanks in each wing. The two fuel pressure gauges show the pressure produced by the fuel pumps. This pressure is measured at the inlet of the fuel metering unit. The fuel flow indicator is a pressure gauge that reads the pressure drop across the fuel injector nozzles and is calibrated in either gallons per hour or in pounds per hour of fuel burned
Figure 1.3: Typical fuel system for a high-performance
single-engine airplane using a Teledyne-Continental fuel injection system.
Figure 1.4: Typical fuel system for a twin-engine airplane using an
RSA fuel injection systems.
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