Maintenance Manual DG-808C
Issued: June 2005
1.19
1.13.3
Fuel pumps
Electric fuel pump mounted in the fuselage centre section. This pump
operates as soon as the ignition is switched on. In case the electric
power is switched off via the master switch with running engine, the
pump will receive electric power directly from the generator.
Min. fuel flow at the electric pump: 40 l / hour (10.6 U.S.gal. /hour).
The fuel flow can be determined by disassembling the fuel supply line
at the distributor near the carburettor and flowing 1 litre (.26 U.S.gal.)
of fuel into a container. Max. time for 1 litre: 90 seconds. (The fuselage
tank should contain at least 10 l (2.6 U.S. gal.) of fuel for the
measurement). Should the flow rate be lower, then the filter could be
dirty or there could be an obstruction elsewhere in the fuel system.
In line to the pump described above, a second pump is installed. This
pump receives its electric power only from the generator, so it operates
only with the engine running. It is protected by a separate fuse located
in the control unit, so that this pump operates even with the main switch
off. Via a press button located in the instrument panel, the first pump
can be switched off with the engine running to check the function of the
second pump.
The excess fuel line with built in restriction limits the fuel pressure.
1.13.4
Fuel cock
The fuel cock is mounted on the fuselage floor between the tank and the
electric fuel pump. The cock is controlled by a diameter 2 mm (0.08
in.) piano-wire from the cockpit. The stops are located directly at the
lever of the fuel cock.
1.13.5
Fuel filter
The filter is installed between fuel cock and electric fuel pump. The
filter is visible in the baggage compartment.
Warning:
Use only a transparent filter, type see section 8.1.
1.13.6
Fuel quantity indication
The fuel quantity measuring system in the fuselage tank is by condenser
plates. The aircraft's attitude hardly affects the readout. Incorrect
readings can result if the condenser plates are dirty. A thorough
flushing of the plates and fuel tank should solve the problem. As
different fuel qualities may result in different readings a calibration
should be carried out each time the tank is filled completely, see sect.
1.13.2.3.
After replacement of the DEI-NT you have to execute a complete fuel
gauge calibration according to sect. 4.22.
Summary of Contents for DG-800A
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