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in the left fuel tank and the right fuel tank. The fuel quantity indicator shows the fuel quantity with a
chain of LED's. The display shows the fuel quantity in US gallons. The maximum indicated fuel quantity
is 14 US gal per tank.
The low fuel sensor in the left tank operates a caution light on the annunciator panel. When the fuel
level in the left tank falls below 3 US gal (+2/-1 US gal) the caution light comes on. Refer to Section
31-51 for more data on the LOW FUEL caution light.
AIRCRAFT
Fuel System
DA 40 Series
AMM
Page 2
20 Sep 2007 28-41-00 Doc # 6.02.01
Rev. 5
Left Fuel Tank
Fuel Temperature Sensor
Low Fuel Sensor
Fuel Quantity Probe
VIEW ON INBOARD END OF LEFT FUEL TANK
Figure 1: Fuel Quantity Indication Components in the Left Fuel Tank
AIRCRAFT
DA 40 Series
AMM
Fuel System
Doc # 6.02.01
Rev. 5 28-41-00 Page 3
20 Sep 2007
Right Fuel Tank
VIEW ON INBOARD END OF RIGHT FUEL TANK
Fuel Quantity Probe
Temperature Sensor
Low Fuel Sensor
%
%
%
%
%
%
%
%
%
%
%
%
%
%
%
%
%
%
%
%
%
%
%
Figure 2: Fuel Quantity Indication Components in the Right Fuel Tank
AIRCRAFT
Fuel System
DA 40 Series
AMM
Page 4
20 Sep 2007 28-41-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Fuel System
Doc # 6.02.01
Rev. 5 28-41-00 Page 101
20 Sep 2007
Trouble-Shooting
1. General
The table below lists the defects you could have with the fuel quantity indicating 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
Fuel quantity indication for one
tank incorrect, or first and last
LED on fuel quantity indicator
illuminated. Other tank reads
correctly.
Fuel probe unit in fuel tank
defective/contaminated.
Fuel quantity indication system
wiring defective.
Defuel/refuel the related tank to
flush the fuel probe. If the
indication is still incorrect then
replace the fuel probe.
Do a test of the indication
system wiring. Refer to Chapter
92-00 for the wiring diagrams.
Fuel quantity indication on both
tanks incorrect/blank.
Fuel quantity indicator
defective.
Fuel quantity indication system
wiring defective.
Replace the fuel quantity
indicator.
Do a test of the indication
system wiring. Refer to Chapter
92-00 for the wiring diagrams.
Fuel low level caution shows
on the annunciator panel when
the left tank has more than 5
US gal of fuel.
Fuel low level sensor defective. Replace the fuel low level
sensor.
AIRCRAFT
Fuel System
DA 40 Series
AMM
Page 102
20 Sep 2007 28-41-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Fuel System
Doc # 6.02.01
Rev. 5 28-41-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
The maintenance practices in this Section tell you how to replace a fuel tank probe and a fuel tank
sensor.
Refer to Section 31-11 for data on removing/installing a fuel quantity indicator.
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 a 'Low Fuel' Sensor
Each tank has a low fuel sensor.
Obey the safety precautions for fuel at all times.
A. Remove a 'Low Fuel' Sensor
Detail Steps/Work Items Key Items/References
(1) Remove the wing that has the low fuel sensor that
you will remove.
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 off the studs and clear
of the airplane.
(3) Disconnect the electrical cables for the low fuel
sensor.
At the in-line connector.
(4) Remove the low fuel sensor from the tank.
AIRCRAFT
Fuel System
DA 40 Series
AMM
Page 202
20 Sep 2007 28-41-00 Doc # 6.02.01
Rev. 5
B. Install a 'Low Fuel' Sensor
Detail Steps/Work Items Key Items/References
(1) Install the low fuel sensor in the fuel tank:
S Apply sealant to the thread of the low fuel
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