Diamond DA 40 Flight Manual page 120

Normal Operating
Procedures
Standard Tank:
Depending on the type of fuel probes installed, the indicator
can read a maximum of 15 US gal or 17 US gal (refer to
Section 7.10 for details). When the fuel quantity indicator
reads the maximum amount of fuel detectable, the correct
fuel quantity must be determined with the fuel quantity
measuring device. If this measurement is not carried out, the
fuel quantity available for flight planning is the indicated
amount.
Long Range Tank:
At an indication of 16 US gal the quantity of auxiliary fuel can
be determined by switching the AUX FUEL QTY switch to the
respective position (LH or RH). The auxiliary fuel quantity is
added to the 16 US gal.
An auxiliary fuel quantity of less than 3 US gal cannot be
indicated by the system. In this case the quantity must be
determined by means of the fuel quantity measuring device
(see Section 7.10 - FUEL SYSTEM).
Long Range Tank:
The correct indication of the fuel quantity takes 2 minutes after
actuation of the switch.
CONTINUED
Page 4A - 4
CAUTION
Rev. 8 01-Dec-2010
NOTE
DA 40 AFM
Doc. # 6.01.01-E