73-00-00 Engine Fuel and Control
1. General
This chapter contains information and maintenance procedures about the engine fuel system.
For approved fuels refer to the Operation Manual and the Airplane Flight Manual.
2. System Description
The E4 engine has a common rail fuel injection system. The fuel rail is a high-pressure fuel reservoir,
which supplies fuel to solenoid type injectors. Fuel goes into the fuel rail directly from the high
pressure pump which compresses the fuel up to 1600 bar for E4 and E4P. A fuel metering unit
controls the necessary fuel quantity. The fuel metering unit is attached direct to the high pressure
pump.
The rail pressure sensor measures the fuel pressure in the rail.
The EECU compares the rail pressure with a target value and adjusts the rail pressure via the pressure
control valve to the target pressure. Fuel released by the pressure control valve flows back to the
tank. The fuel rail supplies fuel through the injector supply tubes. Excess fuel from the injectors drains
into the return line.
The fuel pressure supplied to the injectors is varied continuously. A higher fuel pressure provides
better vaporization and therefore better combustion, as well as shorter injection duration and supply
of necessary fuel volume at the optimal time. By changing the fuel pressure, the injection time can be
changed for a given fuel injection volume per cycle, providing better combustion at lower RPM.
Fig. 73 - 1 Common Rail Fuel System
Rail Pressure Control Valve
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