Answers - Fuel Systems


1. hard engine starting, slow warm‐up, slow
2. explode, detonate
3. vaporizes, carburetor
4. 30‐40 °F, humid
5. explosion, pressure, temperature
6. lower, higher
7. main, auxiliary, surge
8. rigid removable tanks, bladder tanks, integral fuel
9. sump
10. wiring
11. gate, plug
12. quickly
13. engine driven fuel pump
14. positive, vapor lock
15. vane type
16. crossfeed system, fuel transfer
17. large, fuel system
18. micronic, 10‐25
19. fuel heaters
20. Direct current (DC)
21. Stain, seep, heavy seep, running
22. 1/1/2 inches, 4 inches
23. dried and ventilated, combustible gas indicator
24. cloudy
25. Over the wing, pressure refueling


1. true
2. false; turbine fuel has a higher flash point than AVGAS
3. true
4. false; higher cylinder head temperature
5. true
6. false; Jet A is the most common
7. false; pump feed system
8. true
9. true
10. false; aircraft equipped with integral fuel tanks have fuel vent systems and fuel jettison systems dump fuel when the take off weight is higher than the landing weight
11. true
12. false; to the engine driven fuel pump
13. false; variable displacement pump
14. false; lowest part of the tank
15. true
16. true
17. false; electronic fuel quantity systems have no moving part which is one of their advantages
18. true
19. false; they measure fuel mass
20. true
21. false; must be repaired before the next flight because vapors in these areas could cause a fire or explosion
22. true
23. false; organisms do not grow in AVGAS, only turbine fuel
24. true
25. true


1. If take off weight is higher than the landing weight, in an emergency these aircraft need to reduce the weight to a specified landing weight.

2. Rigid removable cell, bladder‐type cell, integral fuel cell

3. The structure of the cavity that the cell fits into.

4. alerts the flight crew that there may be danger of ice crystals forming in the fuel.

5. To provide an interconnected fuel system so that fuel can be fed from various tanks to any engine.

6. crossfeed, transfer, ON or OFF

7. compare the fuel quantity in the tank with the indication of the electronic fuel quantity system.

8. An underwing or single‐point pressure fueling system.

9. reduces fueling time, eliminates aircraft skin damage, and reduces chances of contamination.

10. The tank is pressurized with up to 1/2 psi air pressure and liquid soap is added to detect leaks.

11. An internal component fuel leak (shutoff valve, selector valve, or crossfeed valve).

12. Sight glass, mechanical, electrical, and electronic.

13. It measures by weight instead of volume.

14. resist surging from changes in the attitude of the aircraft.

15. allow water and sediment to settle to the drain point.

16. drain the water out of the tanks.

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