Cessna 182 - Auxiliary Fuel Pump

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Auxiliary Fuel Pump
59. An electric auxiliary fuel pump is provided for engine starting, minor
vapour purging, and emergency operation should the engine driven fuel pump
fail. The unit is a two stage pump. With the throttle open to a cruise power
setting, the pump operates at a high enough capacity to supply sufficient fuel
to maintain flight with an inoperative engine driven fuel pump. When the
throttle is moved to the closed position, the flow rate is automatically reduced,
preventing an excessively rich mixture when the engine is operated at low
power settings.
a.
60. The pump is controlled by a switch located on the left hand side of the
pilot’s lower sub panel, immediately below the Master Switch.
61. The auxiliary fuel pump switch is a three position switch operated as
follows:
a. Switch Up – PRIME (spring loaded back to OFF)
b. Switch Centred - OFF
c. Switch Down – ON
Figure 1-39 Auxiliary
Fuel Pump Switch
WARNING
The auxiliary fuel pump shall not be used in flight, except in an
emergency. With the auxiliary and engine driven pumps
simultaneously operating, excessively rich fuel mixture will result in
rough running and possibly engine failure.