Cozy III
Pilot’s Operating Handbook Page 45
FUEL SYSTEM
♦ Check that the fuel caps seal securely and the vent system
is clear and without leaks and that grounding wires are
attached to the fuel caps.
♦ Check you fuel selector valve for proper function (left, right,
and off).
♦ Do not use a valve with a "both" position. Make sure you
can feel the detent at each position (to avoid taking off
without full fuel flow). After flushing the entire fuel system,
check your fuel filter and carburetor filter (at the carb inlet)
for contamination. If any, clean.
♦ Calibrate your fuel gauges with the aircraft level. If the fuel
level isn't clearly visible, sand the gauge area to a very
smooth surface with 220 sandpaper and paint on a clear
coat of epoxy (laying a piece of smooth plastic film over the
epoxy while it is curing and stripping it off later will insure a
glass-smooth surface and greater transparency).
♦ Check freedom of fuel valve. If it requires more than 10 lbs.
of force at the handle, the valve must be overhauled or
lubricated with an approved fuel valve lubricant, or replaced.
CAUTIONS
Under no circumstances should fuel of a lower octane rating than
that specified by the manufacturer for your engine be used. It
will result in power loss, possibly detonation at high power
settings, and possible catastrophic engine failure. Be sure the
minimum octane for your engine clearly labeled at each fuel cap.
Color coding for 80/87 is red, 100LL is blue, and 100/130 is
green.
Under no circumstances should auto fuel be used in your engine
or tanks, EAA tests notwithstanding. Auto fuels are not blended
to the same high standards as aviation fuel, i.e. octane rating,
vapor pressure, chemical composition, etc. Some unleaded auto
fuels have very high aromatic content, which makes them very
powerful solvents. All it would take is one bad tank full, and you
would lose many times the amount you might hope to save.
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