Electrical Fuel Pump; Requirements Of The Fuel System - Rotax 912 Series Installation Manual

1.2.2) Electrical fuel pump

The engine manufacturer recommends the use of an electrical auxiliary
General note
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.
NOTE:
Operating limits
1.3)

Requirements of the fuel system

Electric or mechanical fuel pump:
Delivery rate
- Min. 35 l/h (8.2 US gal/h).
See
Fuel lines
Secure fuel hoses with suitable screw clamps or by crimp connection.
Fuel return line
Effectivity: 912 Series
Edition 2/Rev. 0
BRP-Powertrain
INSTALLATION MANUAL
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.
The fuel pressure of an additional auxiliary fuel pump
NOTICE
WARNUNG
should not exceed 0.3 bar (4.4 psi).
Fig. 2.
Fuel lines have to be established to the latest require-
NOTICE
WARNUNG
ments such as FAR or EASA by the aircraft manufac-
turer.
For prevention of vapour locks, all the fuel lines on the
NOTICE
WARNUNG
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
NOTICE
WARNUNG
return line. The fuel pressure can be adjusted using
different adapter sleeve.
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page 6
August 01/2012