Airplane Manual FK 9
B&F Technik Vertriebs GmbH
Revision 20
System Description
page 7-5
7.10.
Fuel System
There are two fuel tanks with a total capacity of 60 liters mounted behind the
pilots seats. The fuel valve (ROTAX only) is located at the center console
with positions ON and OFF. The version with SMART engine has no
additional fuel valve because its
electrical fuel pump closes the fuel line
as soon as the ignition is switched off.
One (optional) fuel drain valve is
located at the lower fuselage aft of the
main landing gear. There is one fuel
pump normally providing fuel to the
engine.
ROTAX only: Additionally there is an
electrical fuel pump which should be
ON during takeoff and landing.
One (optional) fuel pressure warning
light indicates fuel pressure below
minimum. In this case switch on the
electrical fuel pump.
Fuel quantity is indicated by a gauge
at the tank. After refuelling, this
indication is accurate after both tanks
have levelled. This can take up to 5
minutes.
Additionally installed is an electrical gauge on the center console. This
gauge offers a rough estimate of the current fuel quantity. The accuracy of
the gauge is not sufficient for flight planning purposes. This gauge indicates
less than full with tanks completely filled.
Although the fuel cap has a water drain, it is recommended to secure the cap
from water entering during strong rain by putting an extra cover on top of the
cap when the aircraft is parked. The same applies to the openings on top of
the engine cowling.
Additional Wingtanks (option)
Additional flexible fueltanks (capacity 20 Liter each) can be installed in the
wings of the FK 9. They are connected to the main tank and are filled and
emptied by using an electrical pump. The overflow / vent (23) is connected to
the vent system (8) of the main tank. Each tank has a fuel valve (19).
