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7.
FUEL SYSTEM
Shape and arrangement of the fuel system must ensure the functioning of the engine within the
limits given.
Fuel pressure at the carburettor system in atmospheric conditions Rotax 914:
Maximum
…..……………….......0,35bar
Minimum
……….…………........0,15bar
Nominal …….……….…….......…0,25bar
M
inimum Flow …..95 Lt/hour @5800rpm
The exceeding of the specified maximum fuel pressure can lead to a overtaking
of the seal of the float valve inside the carburettor resulting in an engine
shutdown.
In supercharged or turbo engines, the “Boost Pressure” increase the maximum
fuel pressure in equal measure of boost pressure ,
thanks at “pressure fuel
regulator”.
Fuel pressure Electronics Fuel injection system:
Maximum …………......………..3Bar*
Minimum Flow
………..…100Lt /Hour*
* Measured with the pump @15°C Fuel temperature
The fuel lines must be designed according to the latest standards required by the
manufacturer as FAR or JAR aircraft. To prevent the formation of steam inside
the pipes, all the pumps and fuel lines must be isolated against heat and kept at
a suitable distance from all hot parts such as exhausts, air and oil cooling
system. In some cases it is necessary to direct a flow of fresh air.
During all operations on the fuel system, pay attention that gasoline do not spill
out during the pipe and joint disconnection. In the section of pipe that goes from
the fuel pump to the engine entrance may be high pressure. Do not work near
heat, open flames or sparks.