Cessna 1971 Super Skymaster - Section VII- Optional Systems

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OPTIONAL SYSTEMS
This section contains a description, operating procedures, and per-
formance data (when applicable) for some of the optional equipment which
may be installed in your Cessna. Owner's Manual Supplements are pro-
vided to cover operation of other optional equipment systems when in-
stalled in your airplane. Contact your Cessna Dealer for a complete
list of available optional equipment.
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AUXILIARY FUEL SYSTEM
An auxiliary fuel system is available as optional equipment. The sys-
tem consists of two tanks, each containing 18 gallons (108 pounds) usable,
one located in each inboard wing panel. The tanks feed directly to the fuel
selector valves, the left tank providing fuel to the front engine only and the
right tank providing fuel to the rear engine only. Fuel quantity for the aux-
iliary tanks is read on the same fuel quantity indicators used for the main
fuel tanks. This is accomplished when the fuel selector valve handles
are turned to the "AUXILIARY" position. As a selector valve handle is
turned to this pOSition, it depresses a gaging button, labeled "PUSH TO
GAGE",
located in the "AUXILIARY" quadrant of the fuel selector valve
placard. The depressed button actuates a microswitch and electrically
senses auxiliary fuel rather than main fuel quantity. Auxiliary fuel quan-
tity can
be checked without changing the selector valve handle, by depres-
sing the "PUSE TO GAGE" button manually.
Whenever fuel is being used from the auxiliary fuel tanks, fuel vapor
and excess fuel from the engine-driven fuel pumps are returned to the
main fuel tanks. Therefore, if the auxiliary tanks are to be used, select
fuel from the main tanks for 60 minutes prior to svd~hing to auxiliary
tanks. This is necessary to provide space in the main twks for the re-
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