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% The inboard fuel chamber has the outlet for the fuel feed to the engine. A finger filter prevents % debris from entering the fuel system. A drain valve is located in the lower surface of the inboard % fuel chamber. You can use this drain point for defueling the fuel tank and for doing fuel % contamination tests.
% A fuel sensor and a fuel probe attach to the inboard end of each of the inboard fuel chambers. A % fuel probe also attaches to the inboard end of each of the long range fuel chambers. Refer to % Section 28-40 for more data on the fuel quantity indication system.
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Fuel System
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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.  Replace filler cap gasket. 
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. 

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Fuel System
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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
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Detail Steps/Work Items  Key Items/References 
(1)  Remove the wing which has the fuel tank that you will remove and support the wing on trestles.  Refer to Section 57-10. 
(2)  Remove the access panel from the root rib of the wing: S Remove the 11 nuts and washers from the studs. S Pull the access panel of the studs and clear of the airplane. 
(3)  Remove the fuel drain valve: S Remove the access panel. S Cut the lock-wire. S Remove the drain valve from its mounting.  Refer to Figure 3 (Standard Tanks) or Figure 4 (Long Range Tanks). Refer to Section 52-40. 
(4)  Disconnect the electrical connector for the fuel probe in the inboard chamber.  At the in-line connector. 
(5)  Disconnect the electrical connector for the fuel sensor in the inboard chamber.  At the in-line connector. 

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AIRCRAFT
Fuel Filler Cap Attaching Screw
Bonding Cable
Fuel Filler Flange

O-Ring Seal Check Valve
Spacer Ring Capillary Hose Vent Hose
Fixing Ring

Flexible Coupling Vent/Balance Hoses
Bonding Cable  Connecting Link  Fuel Sensor 
Mounting Bands  Fuel Probe 
Fuel Drain  Bonding Cable  Fuel Outlet and Finger Filter 
%  Figure 3: Remove/Install the Standard Fuel Tanks 

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DA 40 Series

Detail Steps/Work Items  Key Items/References 
(6)  Release the bonding cable from the inboard end of the inboard chamber: S Remove the nut and washer from the bolt. S Remove the bonding cable from the bolt and move it clear of the fuel chamber. S Remove the bolt. 
　
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