Cessna 1971 Super Skymaster - Page 10

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SYSTEM
INDIC_IO.
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Figure 2-2.
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AUXILIARY FUEL PUMP SWITCHES.
The auxiliary fuel pumps are electrically operated and are located in
the inboard wing panels near the leading edge. The pumps are controlled
by two split rocker-type switches located on the lower left switch and con-
trol panel. The switches are labeled "AUX PUMPS", "LEFT MAIN" and
"RIGHT MAIN." One
side of each switch is red in color and is labeled
"HI"; the other side is yellow in color and is labeled "LOW." The "LOW"
side operates the pumps at low speed, providing sufficient fuel for pri-
ming and starting. The "HI" side operates the pumps at high speed, sup-
plying sufficient fuel flow to maintain normal power in the event of engine-
driven fuel pump failure. In addition, the "HI" side should be used for
vapor elimination in flight, normal engine starts in very hot or cold
weather, and in-flight engine starts after running an auxiliary fuel tank
dry.
When the engine-driven fuel pump is functioning and the auxiliary fuel
pump is turned on "HI, .. a fuel/air ratio considerably richer than best
power is produced unless the mixture is leaned. With the engine stopped
and the master switch on, the cylinder intake ports can be flooded if the
"HI" side of the auxiliary fuel pump switch is aCcidentally turned on.
If it is desired to completely exhaust the contents of an auxiliary fuel
tank in flight, the auxiliary fuel pump will be needed to assist in restart-
ing the engine when fuel exhaustion occurs. Therefore, proper operation
of the auxiliary fuel pump should be verified prior to running the auxiliary
tank dry by turning the auxiliary fuel pump on momentarily (while using
from the main tank) and checking for a slight rise in fuel flow indication.
To ensure a prompt engine restart in flight after running an auxiliary
fuel tank dry, switch to the main tank containing fuel at the first indica-
tion of fuel pressure fluctuation and/or a power loss, and place the auxili-
ary fuel pump SWitch in the "HI" pOSition momentarily (3 to 5 seconds) with
the throttle at least 1/2 open. Excessive use of the "HI" position of the
auxiliary pump can cause flooding of the engine as indicated by a short (1
to 2 second) period of power followed by a loss of power. This can later
be detected by a fuel flow indication accompanied by a lack of power. If
flooding does occur, turn off the auxiliary fuel pump switch. Normal pro-
peller windmilling should start the engine in 1 to 2 seconds.
If the propeller should stop (possible at very low airspeeds) before
the tank containing fuel is selected, place the auxiliary fuel pump switch
In the "HI" pOSition and advance the throttle promptly until the fuel flow
Indicator registers apprOximately 1/2 way into the green arc for 1 to 2
2-3
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