Crosswinds Aviation DA20 C1 Eclipse, Training Manual

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Copyright © 2019 by Midwest Air LLC
from the filler neck through the fuselage bottom skin to the exterior of the airplane. The vent
line is the translucent plastic hose adjacent to the left wing root. The tank has an integral
sump which must be drained prior to each flight, by pushing up on the brass tube which
protrudes through the underside of the fuselage.
Fuel is gravity fed from these outlets to a filter bowl (gascolator) and then to the electric fuel
pump. The filter bowl must be drained prior to each flight, by pushing up on the black rubber
tube that protrudes through the underside of the fuselage. An electric fuel pump primes the
engine for engine starting (Prime ON) and is used for low throttle operations (Fuel Pump
ON). When the pump is OFF, fuel flows through the pump internal bypass. From the electric
pump, fuel is delivered to the engine’s mechanical fuel pump by the fuel supply line. Fuel is
metered by the fuel control unit.
The DA20-C1 is equipped with a DUKES constant flow, vane type, two speed, and electric
fuel pump. This pump emits an audible whine when it is switched on. The pump’s high speed
setting is used for priming the engine prior to engine start. The prime setting is selected by
turning the FUEL PRIME switch ON. An amber annunciator indicates that FUEL PRIME ON
is selected. The pump’s low speed setting is required for maintaining positive fuel supply
system pressures at low throttle settings (approx. 1000RPM and less). Turning the priming
pump on while the engine is running, will enriches the mixture considerably. which may
cause rough engine operation or engine stoppage. It is therefore recommended that for
normal operations, the FUEL PRIME be turned OFF.
Instructo
r’s Note: Never dump sumped fuel back into the aircraft unless your strainer
has been cleaned prior to taking a fuel sample.
Figure 2: Diamond DA20-C1 fuel system diagram