S
ECTION
7: A
IRPLANE
AND
S
YSTEMS
C
IRRUS
D
ESIGN
F
UEL
S
YSTEM
SR20
7-40
P/N 11934-005
Drain valves at the system low points allow draining the system for main-
tenance and for examination of fuel in the system for contamination and
grade. The fuel must be sampled prior to each flight. A sampler cup is
provided to drain a small amount of fuel from the wing tank drains, the
collector tank drains, and the gascolator drain. If takeoff weight limitations
for the next flight permit, the fuel tanks should be filled after each flight to
prevent condensation.
Fuel Selector Valve
A fuel selector valve, located at the rear of the center console, provides the
following functions:
•
LEFT Allows fuel to flow from the left tank
•
RIGHT Allows fuel to flow from the right tank
•
OFF Cuts off fuel flow from both tanks
The valve is arranged so that to feed off a particular tank, the valve should
be pointed to the fuel indicator for that tank. To select RIGHT or LEFT,
rotate the selector to the desired position. To select Off, first raise the fuel
selector knob release and then rotate the knob to OFF.
Fuel Pump Operation
Fuel pump operation is controlled through the Boost Pump switch located
adjacent to the fuel selector valve. A single-speed emergency fuel pump
allows the fuel pressure to rapidly achieve proper starting pressure.
Selecting ON energizes the fuel pump to deliver a continuous 23 psi boost
to the fuel flow for priming, emergency backup, and vapor suppression in
a hot fuel condition.
The fuel pump operates on 28 VDC supplied through the 5-amp FUEL
PUMP circuit breaker on MAIN BUS 2.
Reissue A
