Diamond Aircraft DA 40 NG, Airplane Flight Manual

Page: 291 / 326

DA 40 NG AFM
Airplane
Description
Doc. # 6.01.15-E Rev. 3 01-Jul-2014 Page 7 - 31
CAUTION
Switching the fuel valve to the EMERGENCY position will start
the transferring of fuel with the help of the electrically driven
and engine driven fuel pumps from the auxiliary tank through
the fuel return line to the main tank at a rate of approximately
45 US gal/h (170 liter/h) with FUEL PUMPS switch in OFF
position. The fuel valve must be switched back to the
NORMAL position before the auxiliary tank indication reads
zero. If the fuel valve is not switched back to the NORMAL
position, the engine will stop running as soon as the auxiliary
tank is empty.
Fuel Pumps
The engine is supplied with fuel by two parallel installed independent low pressure
electrically driven fuel pumps. During normal operation one of the two fuel pumps is always
working. In case of a low fuel pressure, the ECU switches automatically to the second
fuel pump. During landing and take-off, or in case of a low fuel pressure both fuel pumps
can be activated with the FUEL PUMPS switch. If both fuel pumps are are set to ON the
fuel pressure increases.
Each fuel pump is electrically connected to an ECU BUS and protected by a 7.5 A circuit
breaker.
NOTE
By switching between ECU A and B the two independent
electrical fuel pumps are switched over as well. In case of an
emergency both pumps can be activated simultaneously by
pushing the FUEL PUMPS switch to the ON position.