HOAC AUSTRIA
DV 20 Flight Manual
Description
The tank, made from aluminum, is located behind the seats, below the baggage compartment. It
holds 79 liters (20.9 US gal.), 77 liters (20.3 US gaL) of which are usable. The tank filler on the left
side of the fuselage behind the canopy is connected to the tank with a rubber hose. The tank vent line
runs from the filler connection piece through the fuselage bottom skin to the exterior of the airplane.
A finger filter is installed at the bottom of the tank. Form there, the fuel is led to the electric fuel
pump, and from there through the center console to the fuel shut-off valve. From the fuel shut-off
valve it is led to the firewall breach, and further on to the mechanical fuel pump. From there, the fuel
reaches the cross-shaped fitting and finally the float chambers of both carburetors. A return line runs
from the cross-shaped fitting to the tank. Flexible, stainless steel wire bride coated teflon hoses are
used for all fuel lines.
A fuel pressure sensor is installed on top of the cross-shaped fitting. As soon as the fuel pressure
drops below 0.1 bar (1.45 psi), the fuel pressure waming light will illuminate.
Electrical fuel
The electrical fuel pump is deSigned as an emergency pump which is normally not in operation. It is
checked for operation during the engine starting procedure and is switched on for take-off and landing
to provide additional safety.
Fuel shut-off valve
The fuel shut-off valve is located on the left hand side of the center console near the pilot's feet. In
the open position the tap is parallel to the direction of flight. The valve is protected against
unintentional shut-off by a safety device.
Revision No.
1
WARNING
The fuel shut-off valve should only be closed during engine fire or fuel
system maintenance. After reopening, the safety device should be
checked to ensure it perfomns the proper safety function. Otherwise the
danger of operating the airplane with the fuel shut-off valve closed
(engine failure) is given!
Reference
Date
December 30, 1 994
Page
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