4.14. FUEL SYSTEM USE
Fuel system consists of two integral fuel tanks connected by fuel valve.
It is necessary to check fuel level and switch between tanks if needed.
According to requirements of engine manufacturer, the fuel system
possess of return line back to left fuel tank.
Electric fuel pump is installed behind fuel valve, it works for both tanks.
NORMAL USE of FUEL SYSTEM:
1. START FROM LEFT FUEL TANK
2. Switch between tanks as needed.
3. Fuel return system draws fuel back into left fuel tank, pilot
should check it continuously and switch back to left tank when
right one is nearly empty.
Do not start from right fuel tank, when left tank is full !!!
Excess fuel is returned to the full left tank and continues through
air vent out of the airplane.
4.15. REPEATED TAKE OFF
During the hot days problem with engine re-startup can occur, caused
by overheated fuel in the engine space,. Fuel starts boiling at 70-80°C.
Formed bubbles cause irregular fuel supply and engine can fails during
take off. This effect is called Vapour Lock.
To reduce risk of Vapour Lock, T connection of return line is placed in
highest position of fuel hoses.
Most of the airplanes has one or two temperature sensors inside
engine space and at fuel hose installed, so pilot has information about
these temperatures. Temperatures over 60
o
C has yellow indication,
attention is needed, over 70
o
C has red indication, risk of Vapour Lock.
Recommendation is to cool engine down, turn airplane against the
wind and run engine at idle, or stop it and let it cool down.
During hot days, we recommend to keep oil doors on upper
motorcowling open, to reduce this problem.
There is no risk of Vapour Lock during the flight. After take off engine
compartment cools down to temperature about 20
o
C above the air
temperature. Engine producer recommend to use AVGAZ fuel in case
of Vapor Lock issues.
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