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) Emergency fuel valve.
) Fuel gascolator with filter.
) Electric fuel transfer pump.
Refer to Section 28-01 for a general description of the fuel system and for the schematic diagram of the
fuel system.
AIRCRAFT
Fuel System
DA 40 Series
AMM
Page 2
20 Sep 2007 28-21-00 Doc # 6.02.01
Rev. 5
Transfer/Emergency Hose
from Right Wing
Emergency Fuel Valve
Gascolator
Return Hose from Right Wing
Return Hose from Engine
Fuel Supply Hose to Engine
Transfer Pump
Fuel Supply Hose
from Left Wing
Fuel Return and Transfer
Hose to Left Wing
Check Valves
Emergency Fuel Valve
Figure 1: Fuel System Components in the Fuselage
AIRCRAFT
DA 40 Series
AMM
Fuel System
Doc # 6.02.01
Rev. 5 28-21-00 Page 3
20 Sep 2007
2. Description
Figure 1 shows the main components of the fuel distribution system for the DA 40 with the TAE 125
Diesel engine installed.
A flexible fuel hose connects the left wing fuel tank to the emergency fuel valve. The emergency fuel
valve is located in the fuselage, under the cockpit floor. The emergency fuel valve connects to the
gascolator.
Flexible hoses connect the outlet from the gascolator to a bulkhead connector at the firewall. A flexible
hose with an integral fire-sleeve connects the bulkhead connector to the inlet to the engine fuel filter.
A flexible hose connects the right wing tank to a T-piece attached to the emergency inlet of the
emergency fuel valve. A flexible hose from the second outlet from the T-piece connects to a check valve
and further to the inlet of the fuel transfer pump. Another flexible hose connects the outlet of the fuel
transfer pump to a T-piece in the return line.
The return line from the engine filter goes through the fuselage to a check valve and further to the
cooling loop inlet of the right wing tank. The cooling loop outlet from the right tank connects to the Tpiece
in the return line and further to the return inlet of the left fuel tank.
3. Fuel System Components
A. Flexible Hoses
The fuel system uses synthetic flexible hoses. The flexible hose in the engine bay have integral fireprotection
sleeves.
You must only use approved hoses in the fuel system which have been pressure tested.
B. Emergency Fuel Valve
The emergency fuel valve is located below the cockpit floor. It is a three-way valve. A long shaft
connects the valve to a control lever which is located in the cockpit. The control lever is mounted in
the center console, aft of the engine control assembly.
To move the control lever you must lift a safety lock on top of the lever while you turn the control
lever.
If you set the control lever to NORMAL then only the left wing tank will supply fuel. If you set the
control lever to EMERG TRANSFER then only the right wing tank will supply fuel. If you set the
control lever to OFF then fuel will not be supplied from the tanks.
AIRCRAFT
Fuel System
DA 40 Series
AMM
Page 4
20 Sep 2007 28-21-00 Doc # 6.02.01
Rev. 5
C. Fuel Gascolator and Filter
The gascolator connects to the emergency fuel valve. It has a filter and it has a fuel drain. You can
remove the filter for cleaning/replacement. Use the fuel drain to drain the fuel distribution system and
to drain fuel when you will do a test for fuel contamination.
D. Fuel Transfer Pump
The fuel transfer pump is located in the fuselage, below the cockpit floor. Electrical power is supplied
from the main electrical bus. The FUEL TRANS ³ switch in the lower left side of the instrument
panel controls the fuel transfer pump. A 10 Ampère circuit-breaker protects the fuel transfer pump
electrical system.
The pump is a high-pressure rotary pump.
% E. Fuel Cooler
% The fuel cooler is located in the RH wing stub between the wing spars. It is accessible through the
% RH main landing gear cover on the bottom side of the RH wing stub.
4. Fuel Transfer System Operation
In the usual operation, fuel flows from the left tank, through the emergency fuel valve to the engine.
Return fuel from the engine passes through the cooling loop in the right tank and then into the left tank.
If the FUEL TRANS ³ switch is set to ON, the transfer pump moves fuel from the right tank to the left
tank until either:
) The fuel transfer pump shut-off switch (high fuel sensor) in the left tank senses that the left tank is
full. This shuts the pump OFF.
) The fuel transfer pump shut-off switch (low fuel sensor) in the right tank senses that the fuel tank is
empty. This shuts the pump OFF.
AIRCRAFT
DA 40 Series
AMM
Fuel System
　
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