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20 Sep 2007
2. Description
Figure 1 shows the main components of the fuel distribution system for the DA 40.
Two flexible fuel hoses connect the left and right wing fuel tanks to the selector/shut-off valve. The
selector/shut-off valve is located in the fuselage, under the cockpit floor. The fuel selector/cut-off valve
connects to the gascolator.
A flexible hose connects the outlet from the gascolator to the inlet of the electric fuel pump. Another
flexible hose connects the outlet of the electric fuel pump to a bulkhead connector at the engine firewall.
A flexible hose with an integral fire-sleeve connects the bulkhead connector to the engine driven fuel
pump.
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. Fuel Selector/Shut-Off Valve
The fuel selector/shut-off valve is located below the cockpit floor. The selector valve is a three-way
valve. A long shaft connects the valve to a selector control lever which is located in the cockpit. The
selector control lever is mounted in the center console, aft of the engine control assembly.
If you set the control lever to LEFT then only the left wing tanks will supply fuel. If you set the control
lever to RIGHT then only the right wing tanks will supply fuel. If you set the control lever to OFF then
fuel will not be supplied from the tanks. To set the control lever to OFF you must lift a safety lock
while you turn the control lever to the OFF position.
C. Fuel Gascolator and Filter
The gascolator connects to the selector 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.
AIRCRAFT
Fuel System
DA 40 Series
AMM
Page 4
20 Sep 2007 28-20-00 Doc # 6.02.01
Rev. 5
D. Electric Fuel Pump (Booster Pump)
The electric fuel pump is located in the fuselage, below the cockpit floor. Electrical power is supplied
from the main electrical bus. A switch in the lower left side of the instrument panel controls the fuel
pump. A five Amp circuit-breaker protects the fuel pump electrical system.
The pump is a high-pressure rotary pump. It will supply fuel to the engine if the engine driven fuel
pump fails.
AIRCRAFT
DA 40 Series
AMM
Fuel System
Doc # 6.02.01
Rev. 5 28-20-00 Page 101
20 Sep 2007
Trouble-Shooting
1. General
The table below lists the defects you could have with the fuel distribution system. If you have the trouble
detailed in the Trouble column read across to the Possible Cause column. Then do the repair given in
the Repair column.
Trouble Possible Cause Repair
Airplane smells of fuel. Hose/Pipe leaking. Examine all hoses and pipes.
Look specially for green stains.
Replace defective components.
Loose connection. Examine all connections. Look
specially for green stains.
Tighten loose connections.
Component leaking. Examine all components. Look
specially for green stains.
Replace defective components.
Fuel pressure low. Fuel pressure indicating
system defective.
Do a test of the fuel pressure
indicating system. Refer to
Section 77-40.
Filter blocked. Examine the fuel filter in the
gascolator. Clean or replace
the filter element. If you find
contamination, then flush the
fuel system.
Fuel pump defective. Do a test of the electrical fuel
pump with the engine shut
down. Also do a test of the
engine-driven-fuel-pump with
the engine running and the
electric fuel pump set to OFF.
Replace defective components.
AIRCRAFT
Fuel System
DA 40 Series
AMM
Page 102
20 Sep 2007 28-20-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Fuel System
Doc # 6.02.01
Rev. 5 28-20-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
This section gives you the maintenance practices for the fuel distribution system. The procedures are
limited to the removal/installation of the main components of the system.
Obey the safety precautions for fuel at all times.
WARNING: DO NOT GET FUEL ON YOU. FUEL CAN CAUSE SKIN DISEASE.
WARNING: DO NOT ALLOW FIRE NEAR FUEL. FUEL BURNS AND CAN CAUSE
INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
WARNING: DO NOT BREATH FUEL VAPOR. FUEL VAPOR CAN MAKE YOU ILL.
2. Remove/Install the Fuel Selector/Shut-Off Valve
　
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