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drops to low-speed
operation.
NOTE
In Prime mode, relay
allows high-speed pump
operation when the oil
pressure is less than 10 psi.
ELECTRIC
AUXILIARY
PUMP FUEL
PUMP
PRIME
BOOST
FUEL
RELAY
OIL
PRESSURE
GAUGE
(LOW PRESSURE)
STARTING
CIRCUIT
GASCOLATOR
ELECTRIC
AUXILIARY
PUMP
R. WING
COLLECTOR
FILLER VENT
R. WING TANK
FILLER
OFF
FEED
RETURN
LEFT
RIGHT
FEED
RETURN
FUEL PRESSURE SWITCH
SELECTOR VALVE
OPERATION
FUEL
FLOW
INDICATOR
ANNUNCIATOR
FUEL
FUEL
QUANTITY
INDICATOR
FUEL
PUMP
PRIME
BOOST
DRAIN
(5 PLACES)
INJECTOR
MANIFOLD
FIREWALL
VENT
L. WING TANK
L. WING
COLLECTOR
FUEL
RELAY
ENGINE DRIVEN
FUEL PUMP
MIXTURE CNTL.
TO
SELECTOR
VALVE
TO
GASCOLATOR
FLAPPER
VALVE
FLAPPER
VALVE
SELECTOR
VALVE
Fuel System
March 2010
Information Manual 7-43
Cirrus Design Section 7
SR20 Airplane Description
The airplane may be serviced to a reduced capacity to permit heavier
cabin loadings. This is accomplished by filling each tank to a tab
visible below the fuel filler, giving a reduced fuel load of 13 gallons
usable in each tank (26 gallons total usable in all flight conditions).
Drain valves at the system low points allow draining the system for
maintenance 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 Quantity Indicator
A dual reading 2¼” fuel quantity indicator is installed on the console
immediately forward of the fuel selector valve. The LEFT pointer
indicates left tank fuel quantity and sweeps a scale marked from 0 to
28 U.S. gallons in 2½-gallon increments. The RIGHT pointer sweeps
an identical scale for the right tank. Each scale is marked with a yellow
arc from 0 to 8.2 gallon. The indicators are calibrated to read ‘0’ when
no usable fuel remains. Each indicator also provides an output signal
to illuminate the FUEL caution light when the fuel quantity goes below
approximately 8-9 gallons in each tank. The indicator is internally
lighted. 28 VDC for fuel quantity system operation is supplied through
the 5-amp ENGINE INST circuit breaker on the Essential Bus.
• Note •
March 2010
7-44 Information Manual
Section 7 Cirrus Design
Airplane Description SR20
When the fuel tanks are 1/4 full or less, prolonged
uncoordinated flight such as slips or skids can uncover the
fuel tank outlets. Therefore, if operating with one fuel tank dry
or if operating on LEFT or RIGHT tank when 1/4 full or less, do
not allow the airplane to remain in uncoordinated flight for
periods in excess of 30 seconds.
Fuel Flow Indication
Fuel flow indication is integral to the combination Fuel Flow/Manifold
Pressure Gage. Refer to preceding discussion on Fuel Flow and
Manifold Pressure Gage for complete description of fuel flow
indication.
Fuel Caution Light
The amber FUEL caution light in the annunciator panel comes on to
indicate a low fuel condition. The light is illuminated by switches in the
fuel quantity gages if the fuel quantity in both tanks drops below
approximately 8.5 gallons (17 gallons total with tanks balanced in level
flight). Since both tanks must be below 8.5 gallons to illuminate the
light, the light could illuminate with as little as 8.5 gallons in one tank
during level flight if the other tank is allowed to run dry.
　
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