Diamond DA 40 Flight Manual page 264

Airplane
Description
Fuel Quantity Measuring Device
The fuel quantity measuring device allows the fuel quantity in the tank to be determined
during the pre-flight inspection. It functions according to the principle of communicating
containers. The fuel quantity measuring device has a recess which fits the airfoil of the
wing. With this recess the device is held against the stall strip at the leading edge of the
wing. The exact position is marked by a bore in the stall strip. Then the metal connector
is pressed against the drain of the tank. The amount of fuel in the tank can now be read
off from the vertical ascending pipe.
For a correct indication the airplane must be placed on a horizontal ground and the fuel
filler must have been opened before.
The designated place for the fuel quantity measuring device is the bag on the rear side
of the pilot's seat.
Different fuel measuring devices are used for the standard
tank and the long range tank. The use of the wrong device
results in a wrong indication.
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CAUTION
Rev. 8 01-Dec-2010
DA 40 AFM
Doc. # 6.01.01-E