Reference
Modification-No.
- 0 -
Page
49
Date
1996 05 10
Install
914 F
14.2) Operating limits
▲ WARNING: Design and layout of the fuel system has to warrant engine operation
within the specified limits.
Fuel pressure:
max. ........................................................................ airbox pressure + 0,35 bar
min. ......................................................................... airbox pressure + 0,15 bar
nominal ................................................................... airbox pressure + 0,25 bar
The fuel pressure of the electric fuel pump must not exceed the manifold pressure by
more than 0,35 bar (5 p.s.i.)
▲ WARNING: Fuel pressure in excess of stated limit can lead to an override of the
float valve with subsequent engine stop.
◆ NOTE: On the standard engine no connection is provided for measuring the
fuel pressure. Refer to chapter 14.5.
14.3) Requirements of the fuel system
➪ fuel lines: See Ill. 30.
▲ WARNING: Fuel lines have to be established to the latest requirements such as
FAR or JAR by the aircraft builder.
■ ATTENTION: The fuel return T 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.
■ ATTENTION: 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 Ill. 30.
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 has to be provided.
The filter has to be controllable for service. A combination of filter/
watertrap is recommended.
➪ Fuel temperature:
To prevent vapour locks temperatures in excess of 36°C (100°F) are not permis-
sible in the vicinity of fuel lines, float chamber and such.
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