page 86
July 01/2008
Effectivity: 914 Series
Edition 2 / Rev. 0
d04279
INSTALLATION MANUAL
BRP-Rotax
14.3) Requirements of the fuel system
- Fuel lines: See Fig. 48.
▲ WARNING: Fuel lines have to be established to the latest requirements such as
FAR or EASA by the aircraft manufacturer.
■ CAUTION: The fuel return (5) must be a line of low flow resistance. Max. tolerated
pressure loss is 0,1 bar (1,5 p.s.i.) between fuel pressure control and
tank inlet with both electric fuel pumps in action. Otherwise the
carburetors could flood.
Secure fuel hoses with suitable screw clamps or by crimp connection.
■ CAUTION: 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.
- Fuel filter: See Fig. 48.
Coarse filter: on fuel tank as per valid certification
Fine filter: in the feed line from tank to the 2 fuel pumps an additional fine filter with
meshsize 0,1 mm (.004 in.) has to be provided.
The filter has to be controllable for service. A combination of filter/
watertrap (gascolator) is recommended.
- water trap:
A suitable water trap must be installed at the lowest point of the fuel feed line.
- Fuel temperature:
To avoid vapour locks keep the temperature of the fuel lines, float chamber and
related deviced below 45 °C (113 °F)
In case of temperatures over 45 °C (113 °F) in the vicinity of fuel lines watch for
vapour lock.
If you should encounter problems in this respect during the test period, than the
affected components such as the supply line to the fuel pumps have to be cooled.
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