FK-Lightplanes FK 9 ELA Manual page 46

Airplane Manual FK 9 ELA FK Lightplanes
Revision 9 Systems Description page 7-11
Option 2 Wing Tanks:
Fuel quantity indication (5) Fuel valve (7)
There are two wingtanks installed. Each tank has a fuel valve and a fuel
quantity indication. Fuel caps and vents are on top of the wings. Fuel feeding
to the engine is similar to option 1. Fuel must be used from one tank at a
time. For takeoff and landing, the fullest tank must be used.
The drain valve is located underneath the wing. It must be assured, that no
fuel spills on the cockpit windows during fuelling / draining, because fuel can
damage lexan windows.
The aircraft for Italy also have a drain valve at the gascolator in the engine
compartment.