Fuel System

1
Fuel System

• Cirrus SR-20 Transition Course

12/23/03
2
General

• Fuel Injection type system
• 60.5 gallon capacity system (56 gallons usable)
• 26 gallon capacity when serviced to tabs (13
  gallons each tank)
• Aviation Grade 100 LL (Blue) or 100 (Green) fuels
  approved for use

3
Components

• Wing Tanks (L/R)
• Collector Tanks (L/R)
• Quantity Indicator
• Selector Valve
• Electric Fuel Pump
• Gascolator
• Engine Driven Fuel Pump
• Fuel Flow Indicator
• Throttle Metering Valve
• Injector Manifold

4
Operation

• Fuel moves from main tanks to collector tanks
  then through the fuel selector valve.

5
Collector Tank

• Fuel from each main tanks is gravity feed through
  a strainer and check valve to each collector
  tank.
• Each collector tank has a fuel sump to check for
  contamination.
• Each collector tank holds .67 gallons of fuel.

6
Operation

• Vent Scoop Flush port located at outboard area
  of each fuel tank
• Maintains positive pressure within the main fuel
  tanks

7
Operation

• Fuel Annunciator Illuminates when each tank
  contains less than 8.5 gallons of fuel
• One tank can be drained of all fuel without a
  fuel annunciation

CAUTION
8
Operation

• Drains Each tank (wing and collector)
  incorporates a fuel drain at the low point of the
  tank
• Fuel should be sampled from these drains prior to
  the first flight of the day and after servicing

9
Operation

• Electric fuel pump used for engine priming and
  vapor clearing
• Boost provides low speed fuel line
  pressurization of 4-6 psi. for vapor suppression
• Prime high speed pressurization to 4-6 psi.
• Electric fuel pump will not maintain fuel
  pressure in the event of an engine driven pump
  failure

WARNING
10
Operation

• Fuel delivered to cylinders controlled by
  Throttle Metering Valve
• maintains appropriate fuel/air mixture
• Gascolator Fuel filter, low point of fuel
  system
• Should be drained prior to the first flight of
  the day and after servicing
• Injector Manifold Spider delivers equal
  amounts of fuel to individual injectors

11
Notes
WARNING

• Maximum Allowable System Imbalance 7.5 Gallons
• Do not allow airplane to operate in uncoordinated
  flight in excess of 30 seconds when operating
  with tanks less than ¼ full
• This may cause fuel ports to be uncovered
  resulting in power loss