d04923.fm
INSTALLATION MANUAL
BRP-Powertrain
Effectivity: 912 Series
Edition 2/Rev. 0
73-00-00
page 6
August 01/2012
1.2.2) Electrical fuel pump
General note The engine manufacturer recommends the use of an electrical auxiliary
fuel pump, if this is not already required by airworthiness requirements.
The electrical auxiliary fuel pump is not just required in case of a malfunc-
tion or defect of the mechanical fuel pump, but also provides required fuel
supply e.g. in case of vapour formation at high altitudes and tempera-
tures.
Operating limits NOTE: If an electrical auxiliary fuel pump is installed, the whole
fuel system has to be designed to warrant engine opera-
tion within the specified pressure limits.
1.3) Requirements of the fuel system
Delivery rate Electric or mechanical fuel pump:
- Min. 35 l/h (8.2 US gal/h).
Fuel lines See Fig. 2.
Secure fuel hoses with suitable screw clamps or by crimp connection.
Fuel return line
The fuel pressure of an additional auxiliary fuel pump
should not exceed 0.3 bar (4.4 psi).
Fuel lines have to be established to the latest require-
ments such as FAR or EASA by the aircraft manufac-
turer.
For prevention of vapour locks, all the fuel lines on the
suction side of the fuel pump have to be insulated
against heat in the engine compartment and routed at
distance from hot engine components, without kinks
and protected appropriately.
At very critical conditions e.g. problems with vapour
formation the fuel lines could be routed in a hose with
cold air flow.
The engine manufacturere requires the use of a fuel
return line. The fuel pressure can be adjusted using
different adapter sleeve.
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