DV 20 E AFM Airplane Description
Doc. No. 4.01.15-E Rev. 2 22-Mar-2022 Page 7 - 33
Gascolator
Fuel is gravity fed to a gascolator below the tank and then to the electric fuel pump unit.
The gascolator acts as a trap for sediment and water that has entered the fuel line from
the tank. The gascolator drain is next to the fuel tank drain. It operates in the same manner
as the fuel tank drain.
The gascolator must be drained prior to each flight, by pushing up on the black rubber
tube that protrudes through the underside of the fuselage, adjacent to the fuel tank drain.
Fuel Pumps
The fuel pump unit contains two serially installed electric fuel pumps. One is the main
pump which works continuously as long as the engine master is switched ON. During
landing and take-off, or in case of low fuel pressure the second fuel pump can be activated
with the emergency fuel pump switch.
A vapour separator is located downstream of the fuel pump unit. The vapour is returned
to the fuel return line via an orifice.
From the electric pumps, fuel is delivered to the fuel injection manifold of the engine via
the fuel feed line through a maintenance drain, the shut-off valve and a fine filter. Fuel
is metered by the fuel control unit and the injector nozzles.
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