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installed. It tells you about these components:
) Fuel tanks.
) Fuel filler assembly.
) Fuel tank vents.
Refer to Section 28-01 for a general description of the fuel system and a schematic diagram of the fuel
system.
AIRCRAFT
Fuel System
DA 40 Series
AMM
Page 2
20 Sep 2007 28-11-00 Doc # 6.02.01
Rev. 5
Left Fuel Tank
Inboard Mounting Rubber (Chafing Protection)
Outboard Mounting Rubber
Adapter for High Fuel Sensor
High Fuel Sensor
Vent Adapters
Flexible Coupling
Worm-Drive Clamps
Worm-Drive Clamps
Bonding Connection
Bonding Connection
Fuel Filler Assembly
Check Valve
(Bleed Type)
Fuel Filler Cap
Vent Pipe with Relief Valve
Drain Valve
Fuel Quantity Probe
Finger Filter
Low Fuel Sensor Fuel Return Line
Vent Hoses
Bonding Connection
Bonding Connection
Bonding Connection
Cable Conduit for
High Fuel Sensor
Temperature Sensor
Figure 1: Left Fuel Tank Installation
AIRCRAFT
DA 40 Series
AMM
Fuel System
Doc # 6.02.01
Rev. 5 28-11-00 Page 3
20 Sep 2007
2. Fuel Tank Description
The airplane has two fuel tanks. Each tank has a usable capacity of 14 US gal (53 liters). One tank is
located in the inner part of each wing. Figure 1 shows the left fuel tank assembly. Figure 2 shows the
right fuel tank assembly.
Each tank is a welded aluminum structure. Baffles in the tank prevent the fuel from moving quickly from
one end of the tank to the other during flight. The tank has bosses welded in the inboard face for the
fuel quantity probe, the low fuel sensor, and the fuel temperature sensor. Other bosses make
connection points for hoses.
A finger filter at the tank outlet prevents debris from entering the fuel system. A drain valve is located
in the lower surface of the tank. You can use the drain valve to defuel the fuel tank and for doing fuel
contamination tests.
The outer face of the tank has a large adapter for the fuel filler assembly. A smaller adapter on the left
tank holds a 'high fuel' sensor. There are also two small adapters at the top of the outer face for vent
hoses.
The right tank has two adapters which connect to a loop of pipe inside the tank. This is the cooling
loop.
A fuel quantity probe attaches to the inboard end of each fuel tank. Refer to Section 28-41 for more
data on the fuel quantity indication system.
Two ribs hold each fuel tank assembly in position. Padded rubber strips go between the tank and each
rib. The filler cap is attached to the upper skin of the wing with 8 screws. It holds the tank assembly
in position in spanwise direction.
AIRCRAFT
Fuel System
DA 40 Series
AMM
Page 4
20 Sep 2007 28-11-00 Doc # 6.02.01
Rev. 5
Right Fuel Tank
Inboard Mounting
Rubber
Outboard Mounting Rubber (Chafing Protection)
Flexible Coupling
Worm-Drive Clamps
Worm-Drive Clamps
Fuel Filler Assembly
Fuel Filler Cap
Vent Hose with Restrictor
Drain Valve
Fuel Quantity Probe
Finger Filter
Vent Hoses
Cooling Loop
Low Fuel Sensor
Fuel Return Line Adapter
Fuel Return Line Adapter
Temperature Sensor
Bonding Connection
Bonding Connection
Bonding Connection
Check Valve
(Bleed Type) Bonding Connection
Bonding Connection
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Figure 2: Right Fuel Tank Installation
AIRCRAFT
DA 40 Series
AMM
Fuel System
Doc # 6.02.01
Rev. 5 28-11-00 Page 5
20 Sep 2007
3. Fuel Filler Assembly
Figures 1 and 2 also show the fuel filler assembly. It is a welded tubular aluminum component,
approximately 75 mm (3 in) in diameter. The outboard end has a flange that attaches to the top skin
of the wing. It also has slots that engage the fuel filler cap.
The filler cap has a locking lever. You pull the locking lever up and turn the filler cap counter-clockwise
to release it. You turn the cap clockwise to install it and push down the locking lever to lock it. The area
just below the flange has four adapters for the vent system hoses.
Note: If the filler cap operates too easily, then it can be leaky. Leaking fuel can cause the
paint finish to become yellow.
A short flexible coupling attaches the fuel filler assembly to the outer face of the fuel tank. Two wormdrive
clamps at each end hold the flexible coupling to the tank and the fuel filler assembly. Two small
　
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