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AIRCRAFT
% % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % Figure 2: Fuel System Schematic Diagram, Long Range Tanks Installed (O.M 40-071) %
Page 4 Doc # 6.02.01 09 Jan 2003 Rev. 4
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Fuel System
AMM
% B. Long Range Tanks (O.M 40.071)
% Figure 2 shows the fuel system schematic diagram for the DA 40 with the Lycoming engine and % the Long Range Tanks installed.
% An inboard chamber, an outboard chamber and a long rang chamber in each wing hold the fuel. % Flexible couplings connect the individual chambers. Each long range chamber has a fuel filler % assembly and a vent connection. Each inboard chamber has a fuel drain and a finger-filter at the % connection to the main fuel feed pipe. Fuel level sensors and probes are installed in each inboard % chamber. Additional fuel probes are installed in each long range fuel chamber.
% Flexible hoses connect the fuel tanks in the wings to the fuel selector valve in the center fuselage. % A gascolator attaches to the selector valve. The gascolator has a filter and a fuel drain valve. A % flexible hose connects the gascolator to the electric fuel pump (booster pump). The electric fuel % pump has an internal fuel by-pass should the fuel pump become defective in flight.
% A flexible hose connects the booster pump to a bulkhead fitting in the firewall and another flexible % hose connects the bulkhead fitting to the engine driven fuel pump.
% Vent pipes connect between each individual fuel chamber. The long range fuel chambers are % vented to atmosphere. Check valves in the vent system prevent fuel from flowing out of the long % range fuel chamber through the vent system.
% The long range fuel chambers also have a small capillary tube which connects to atmosphere. % These capillary tubes allow the air pressure within the tanks to equalize with the ambient pressure. % The outlets for both the main vent system and the capillary vent system are on the fuel tank outer % access panel in the lower surface of each wing.
Doc # 6.02.01 Page 5
Rev. 4 09 Jan 2003
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AMM
3. Operation
With the engine running and the fuel system controls set as follows:
) Electrical fuel pump (booster pump) set to ON.
) Fuel-selector valve set to LEFT or RIGHT.
Fuel flows from the left tank or from the right tank, through finger-filters to the fuel selector valve. The vents system allows air to flow into the tanks from atmosphere, check valves in the vent system prevent fuel from flowing out of the tanks through the vents.
The fuel flows from the fuel selector valve through the gascolator filter to the electric fuel pump. Fuel flows from the pump under pressure to the engine driven fuel pump.
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