1. Cessna C500 Fuel System
hello and welcome to my talk on the c500 fuel system

2. Main Fuel System Components
2 x ‘Wet Wing’ fuel tanks
2 x electric fuel pumps
2 x ejector fuel pumps
2 x engine driven fuel pumps
Crossfeed system
2 x Fuel Filters
2 x Firewall shut off valves

3. Fuel System Limitations
G-LOFT Fuel Capacity 3,806lb
Anti-icing Additive to be used (Prist)
Normal Fuel Used JET A1
Min Fuel Temp. (takeoff) -29ºC
Max Fuel Temp. +48ºC
Max Altitude 41,000ft
Max Fuel Imbalance 800lbs

4. AVGAS Limitations AVGAS is permitted under the following conditions
Fuel temp. not to exceed 32º C
Max OAT (takeoff) 32º C
Boost Pumps are operating
Hours are logged in engine logbook
Max operating altitude 25,000ft

5. Fuel System Components
In NORM Position Boost Pump will Operate Automatically:
During Start Cycle
During Crossfeed
When Low Fuel Pressure Is Sensed In Engine Supply Line
THREE POSN. BOOST PUMP SWITCHES

6. Fuel System Components
In OFF Position Boost Pump will Operate Automatically:
During Start Cycle
During Crossfeed
In ON Position Boost Pump Will Operate Continuously
THREE POSN. BOOST PUMP SWITCHES

7. Fuel System Components
CROSSFEED SELECTOR SWITCH

8. Fuel System Components
FUEL QTY and
FUEL FLOW Indicators

9. Ejector pump Operation
OUTPUT
FASTER
MOTIVE FLOW
LOW PRESSURE
SUCTION
FUEL TANK

10. Fuel System
Component Layout

11. P IN TRANSIT MANUAL SHUTOFF SUMP CROSSFEED VALVES PRIMARY EJECTOR PUMPRH
TANK LH
ENG
MANUAL SHUTOFF
SUMP
CROSSFEED VALVES
PRIMARY EJECTOR PUMP
BOOST PUMP
FUEL FILT
BYPASS
MOTIVE FLOW
SHUTOFF VALVE
LH TANK
RH TANK
RH ENG
FIRE
PUSH
LH ENG P
L FUEL
PRESS LO
R FUEL
MOTIVE FLOW LINE
LH ENGINE
RH ENGINE
ENGINE DRIVEN PUMP
FUEL CONTROL
FLOW TRANSMITTER
OIL COOLER
FLOW DIVIDER
AUTO SHUTOFF
MOTIVE FLOW VALVE

12. Normal Engine Start (Left Engine)
Fuel System
Normal Engine Start
(Left Engine)

13. P IN TRANSIT MANUAL SHUTOFF MANUAL SHUTOFF CROSSFEED VALVES LH TANKRH
TANK LH
ENG
MANUAL SHUTOFF
MANUAL SHUTOFF
CROSSFEED VALVES
FUEL FILT
BYPASS
LH TANK
RH TANK
RH ENG
FIRE
PUSH
LH ENG
MOTIVE FLOW SHUTOFF VALVE
MOTIVE FLOW SHUTOFF VALVE P
L FUEL
PRESS LO
R FUEL
MOTIVE FLOW LINE
ENGINE DRIVEN PUMP
FUEL CONTROL
FLOW TRANSMITTER
OIL COOLER
FLOW DIVIDER
AUTO SHUTOFF
MOTIVE FLOW VALVE
LH ENGINE
RH ENGINE

14. Normal Operation (Both Engines Running)
Fuel System
Normal Operation
(Both Engines Running)

15. P P IN TRANSIT CROSSFEED VALVES OFF FUEL FILT BYPASS LH ENG FIRE PUSHRH
TANK
OFF
TANK LH
ENG RH
ENG
CROSSFEED VALVES
FUEL FILT
BYPASS
LH ENG
FIRE
PUSH
RH ENG
FIRE
PUSH P P
L FUEL
PRESS LO
R FUEL
PRESS LO

16. Crossfeed (Left tank supplying both engines)
Fuel System
Crossfeed
(Left tank supplying both engines)

17. P P IN TRANSIT CROSSFEED VALVES OFF FUEL FILT BYPASS LH ENG FIRE PUSHRH
TANK
OFF
TANK LH
ENG RH
ENG
CROSSFEED VALVES
FUEL FILT
BYPASS
LH ENG
FIRE
PUSH
RH ENG
FIRE
PUSH P P
L FUEL
PRESS LO
R FUEL
PRESS LO

18. P P IN TRANSIT IN TRANSIT IN TRANSIT CROSSFEED VALVES OFF FUEL FILTLH RH
TANK
OFF
TANK LH
ENG RH
ENG
CROSSFEED VALVES
FUEL FILT
BYPASS
LH ENG
FIRE
PUSH
RH ENG
FIRE
PUSH P P
L FUEL
PRESS LO
R FUEL
PRESS LO

19. Fuel Filter Blockage FUEL FLOW FUEL FLOW FUEL FLOW FUEL FILT BYPASS

20. Questions

21. 1 Concerning the fuel system, the correct statement is:
A. The FUEL BOOST pump switches have to be on for engine start.
B. With the FUEL BOOST pump switches off, the respective boost pump will automatically be energized whenever the respective START button is depressed, or when crossfeed from that tank is selected.
C. It is normal for both fuel boost pumps to operate during crossfeed operation.
D. The fuel boost pump will be automatically energized anytime the IGNITION switches are in NORM.

22. 2 After engine start, the fuel boost pump is de-energized by:
A. The FUEL BOOST pump switch
B. Start circuit termination
C. Discontinuing crossfeed
D. A time-delay relay

23. 3 Concerning the fuel system, the correct statement is:
A. In the event of DC power loss, the primary ejector pump ceases to operate and the engine flames out.
B . The respective engine should be shut down if the respective FUEL FILT BYPASS annunciator illuminates.
C. The FUEL BOOST switches should be on for takeoff and landing.
D. The fuel filters should be inspected prior to the next flight if the FUEL FILT BYPASS light illuminates.

24. 4
If the L or R FUEL BOOST ON annunciators illuminate without any action by the crew (engine operating normally), the probable cause is:
A. The engine-driven fuel pump has failed.
B. The firewall shutoff valve has closed.
C. The low-pressure sensing switch has energized the boost pump.
D. The fuel flow compensator has energized the boost pump below 5 psi.

25. 5 To verify that crossfeed is in fact occurring, it is necessary to:
A. Monitor the FUEL QTY indicators for appropriate quantity changes.
B. Only observe that the INTRANSIT light is out.
C. Ensure both FUEL BOOST ON lights are illuminated.
D. Ensure that the FUEL BOOST pump switch for the tank being fed is on.

26. 6
When crossfeed is selected by positioning the crossfeed switch to LH TANK, and the green INTRANSIT light stays on:
A. This is normal.
B . The boost pumps did not actuate.
C. One or both crossfeed valves did not fully close.
D. One or both crossfeed valves did not fully open.

27. 7 Operation of the primary ejector pump is directly dependent upon:
A. DC electrical power
B. High-pressure fuel from the engine-driven fuel pump
C. AC electrical power supplied by the No. I or No. 2 inverter
D. Flow from the transfer ejector pump

28. 8 If the engine-driven fuel pump fails: A. The engine will flame out.
B. The primary ejector pump will fail also, but the boost pump will be energized by low pressure and will sustain the engine.
C. The transfer ejector pumps will also be inoperative.
D. Crossfeed must be selected in order to obtain high-pressure motive flow from the opposite engine.

29. 9
If crossfeed has been selected and normal DC electrical power is lost (system switch in EMER with a dual generator failure):
A. The system will remain in crossfeed.
B . The crossfeed valves will fail closed.
C. Both boost pumps will be energized to terminate crossfeed.
D. The motive-flow shutoff valve will fail open.