CESSNA SECTION
7
MODEL 182T NAV Ill
AIRPLANE AND SYSTEMS DESCRIPTION
FUEL
SYSTEM
(Continued)
AUXILIARY FUEL PUMP OPERATION
The auxiliary fuel pump is used primarily for priming the engine
before starting. Priming is accomplished through the fuel injection
system. If the auxiliary FUEL PUMP switch is accidentally placed in
the ON position for prolonged periods (with MASTER switch turned
on and mixture rich) with the engine stopped, the engine may be
flooded.
The auxiliary fuel pump is also used for vapor suppression in hot
weather. Normally, momentary use will be sufficient for vapor
suppression; however, continuous operation is permissible if
required. Turning on the auxiliary fuel pump with a normally
operating engine pump will result in only a very minor enrichment of
the mixture.
It is not necessary to operate the auxiliary fuel pump during normal
takeoff and landing, since gravity and the engine-driven pump will
supply adequate fuel flow. In the event of failure of the
engine-
driven fuel pump, use of the auxiliary fuel pump will provide
sufficient fuel to maintain flight at maximum continuous power.
FUEL RETURN SYSTEM
A fuel return system was incorporated to improve engine operation
during extended idle operation in hot weather environments. The
major components of the system include an
orificed fitting located in
the top of the fuel servo, a dual stack fuel selector, and a drain
valve assembly. The system is designed to return
fueltvapor back
to the main tanks at approximately
7
gallons per hour. 'The dual
stack selector ensures that fuel returns only to the tank that is
selected as the feed tank. For example, if the fuel selector is
positioned to use fuel from the left hand tank, the fuel return system
is returning fuel to the left hand tank only.
(Continued Next Page)
U.S.
7-43
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