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diameter flexible hoses connect the vent adapters at the top of the tank to the two inboard adapters on
the fuel filler flange.
A bleed type check valve is screwed into one of the two outer adapters on the filler flange. A short
flexible hose connects the bleed type check valve to an adapter in the outer fuel tank access panel in
the bottom surface of the wing.
A second short flexible hose connects to the other outer adapter on the fuel filler flange. It has a
restrictor (right wing) or relief valve (left wing) in it. It connects to an adapter in the outer fuel tank
access panel in the bottom surface of the wing.
Bonding strips connect the tank to the fuel filler assembly and the airplane bonding system.
AIRCRAFT
Fuel System
DA 40 Series
AMM
Page 6
20 Sep 2007 28-11-00 Doc # 6.02.01
Rev. 5
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AIRCRAFT
DA 40 Series
AMM
Fuel System
Doc # 6.02.01
Rev. 5 28-11-00 Page 101
20 Sep 2007
Trouble-Shooting
1. General
The table below lists the defects you could have with the fuel storage 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
Filler cap leaking. Filler cap gasket damaged.
Filler cap does not have a tight
fit.
Replace filler cap gasket.
Tighten nut on lower side of
cap.
Fuel drain valve leaking. Drain valve damaged.
Contamination in drain valve.
Replace fuel drain valve.
Open and close drain valve. Do
this until the drain seals. If the
drain does not seal then
replace the drain valve.
AIRCRAFT
Fuel System
DA 40 Series
AMM
Page 102
20 Sep 2007 28-11-00 Doc # 6.02.01
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AIRCRAFT
DA 40 Series
AMM
Fuel System
Doc # 6.02.01
Rev. 5 28-11-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
These maintenance practices tell you how to remove/install the fuel tanks. 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/Disassemble the Fuel Tank Assembly
A. Remove the Fuel Tank Assembly
Detail Steps/Work Items Key Items/References
(1) Remove the wing which has the fuel tanks that
you will remove and support the wing on trestles.
Refer to Section 57-10.
(2) Remove these access panels from the wing:
S Remove the access panel from the root rib:
S Remove the 11 nuts and washers from the
studs.
% S If access panel is made from aluminium
% (DA4-5741-26-00_2) remove bonding cable.
S Pull the access panel from the studs and
clear of the airplane.
S Remove the access panel for the fuel drain
valve.
Refer to Section 52-40.
(3) Remove the fuel drain valve:
S Cut the lock-wire.
S Remove the drain valve from its mounting.
Refer to Figure 2.
AIRCRAFT
Fuel System
DA 40 Series
AMM
Detail Steps/Work Items Key Items/References
Page 202
20 Sep 2007 28-11-00 Doc # 6.02.01
Rev. 5
(4) Disconnect these electrical connectors:
S Fuel quantity probe.
S Low fuel sensor.
S High fuel sensor (left wing only).
S Fuel temperature sensor.
At the inboard end of the tank.
At the in-line connector.
(5) Release the bonding strip from the inboard end of
the tank:
S Remove the nut and washer from the bolt.
S Remove the bonding strip from the bolt and
move it clear of the tank.
S Remove the bolt.
(6) Disconnect the two vent hoses from the adapters
on the access panel:
S Remove the access panel from the outer
lower surface of the wing.
S Remove the clamps that hold the vent hoses
to the adapters on the access panel.
S Disconnect the vent hoses from the adapters
on the access panel.
Near the outboard end of the filler
assembly.
Refer to Section 52-40.
(7) Disconnect the bonding connection at the
outboard end of the fuel filler assembly.
Through the access panel in the wing
bottom skin.
(8) Release the fuel filler assembly:
S Remove the fuel filler cap and disconnect the
bonding cable.
S Remove the 8 screws which attach the filler
flange.
S Release the filler flange and the O-ring seal. Discard the O-ring seal.
AIRCRAFT
DA 40 Series
AMM
Fuel System
　
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