SECTION
7
AIRPLANE
&
SYSTEMS DESCRIPTION
CESSNA
MODEL 172R
FUEL
TANKS
FUEL LEVEL
(QUANTITY
EACH TANK)
TOTAL
FUEL
TOTAL
UNUSABLE
TOTAL USABLE
ALL
FLIGHT
CONDITIONS
Two
Full (28.0)
56.0
3.0
53.0
Figure 7-5.
Fuel
Quantity
Data
in U.S. Gallons
FUEL
DISTRIBUTION
Fuel
flows
by gravity
from the
two wing tanks to
a three-position
selector valve, labeled BOTH,
RIGHT
and LEFT and
on
to
the
reservoir tank. From the reservoir
tank
fuel flows through
the
auxiliary
fuel
pump,
past
the fuel shutoff valve, through the fuel
)
strainer to
an
engine
driven
fuel
pump.
From
the
engine
driven
fuel pump, fuel
is delivered
to
the
fuel/air
control
unit, where it
is metered and
directed to
a fuel
distribution
valve
(manifold)
which distributes
it
to
each cylinder. Fuel flow into
each
cylinder
is
continuous,
and
flow
rate
is
determined
by
the
amount
of
air
passing
through
the fuel/air control unit.
I
Starting
at
serial number 17281188 and on,
and airplanes
incorporating
MK172-28-01,
a
fuel
return system
was
added
to
promote smooth engine operation
on
the
ground during
hot weather.
The
return
system
carries a metered
amount
of fuel from
the
engine
fuel-air
control unit
to
the fuel reservoir tank.
The
increased
fuel
flow
due to the return system,
results
in
lower
fuel
temperatures at
the
engine
inlet and
helps
to
minimize the
amount
of fuel vapor
generated
in the fuel lines during high
OAT operations.
7-24
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