Pelegrin Tarragon Pilot's Operating Handbook And Flight Manual page 35

To fill the tanks full, fill until fuel touches the bottom part of filler cap flange in one tank, then fill the
second tank. Let it sit for a few minutes, so that the fuel finds its way in the sponge and levels out in
both tanks and top up both tanks. Each tank is designed for 42,5 liters, but real world application
can vary by a small amount.
NOTE: When fuel is just visible through the fuel filling hole near bottom of tank, the tank is only
about half full. Maximum full capacity is indicated when fuel reaches the lower part of the filling
hole flange. This fuel level allows for proper thermal expansion. Overfilling eliminates
expansion space and fuel could leak overboard through the fuel vent.
Pilots Operating Handbook YL-MFG
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Revision 7, Issue 1 4/6/2016