The Fuel System

Question 1

In a gravity-feed fuel system, the tanks must be ______ the engine to provide a head of fuel at the carburettor. Most modern aircraft have a ______ feed system.

Answer 1

above; pump

Question 2

Fuel tanks (are / are not) vented to atmosphere. The fuel supply leaves the tank through a ______ thus there will (always / never) be some unusable fuel in the tanks.

Answer 2

are; stand-pipe; always

Question 3

Fuel quantity indications are likely to be most accurate in the ______ ______ attitude. The gauge indications should (always / never need to be) cross-checked with other means.

Answer 3

level flight; always

Question 4

A master fuel strain and drain point is likely to be situated at the (highest / lowest) point in the fuel system. This enables the system to be checked for and cleared of ______ if necessary.

Answer 4

lowest; foreign matter (or contamination)

Question 5

For safety reasons, fuel selector valves are situated on the (same / opposite) side of the firewall to the engine.

Answer 5

opposite

Question 6

The most common type of engine-driven fuel pump is the ______ -type. This type of pump delivers fuel to the carburettor or fuel control unit at (constant / varying) pressure depending on the setting of its ______ -relief valve.

Answer 6

vane; constant; pressure

Question 7

Electric boost pump(s) are available for use if the engine-driven fuel pump pressure is low or the pump fails.

State two occasions when boost pumps are normally and routinely switched on.

Answer 7

Before starting and critical stages of flight e.g. takeoff, landing, low flying.

Question 8

Priming fuel is normally pumped directly into the ______ ______ or at the head of one or more cylinders. It (does / does not) pass through the carburettor.

Answer 8

intake manifold; does not

Question 9

A very cold engine will require (more I less) priming than normal. A hot engine may possibly require no priming at all (true / false).

Answer 9

.

Question 10

After priming and starting, the engine runs roughly. What is the first thing to check?

Answer 10

.

Question 11

The resistance of a fuel to detonation is represented by its rating or number. A fuel with a rating of 100 is (more f less) prone to detonation than one with a rating of 96.

Answer 11

.

Question 12

Fuel with the same anti-detonation property as iso-octane is given an octane rating of

Answer 12

.

Question 13

Avgas available in New Zealand has a performance number 100/130. The first number relates to the power available, before detonation, with a weak mixture. What does the second number refer to?

Answer 13

.

Question 14

Avgas grade 100/130 is dyed as an aid to identification.

Answer 14

.

Question 15

Spark plug fouling with lead deposits is more likely if the engine is operated for long periods at (high / low) power and (high I low) cylinder head temperatures.

Answer 15

.

Question 16

The use of a lower grade of fuel than that recommended and approved for the engine, is

Answer 16

.

Question 17

The use of MOGAS in an aircraft engine (requires / does not require) specific authorisation.

Answer 17

.

Question 18

Aviation Turbine Fuel (AVTUR) is coloured or clear. It has the distinctive smell of .. AVTUR equipment decals have white lettering on a background. It must not be used in engines.

Answer 18

.

Question 19

The most common contaminant of fuel is

Answer 19

.

Question 20

You can minimise water condensation in the fuel tanks on cool nights by having the tanks (full empty).

Answer 20

.

Question 21

If a fuel tank cap is left off, the fuel (may / will not) siphon out very rapidly in flight due to the (high / low) pressure over the wings.

Answer 21

.

Question 22

Water is (more / less) dense than AVGAS and so will gather at the (top bottom) of the fuel tanks.

Answer 22

.

Question 23

In a fuel drain check, water will appear as small globules at the (top I bottom) of the container. Other impurities will probably appear as a (darker / lighter) sediment.

Answer 23

.

Question 24

A fuel drain check proves positive (i.e. shows water is present in the tanks). A second check also proves positive. What should you do next?

Answer 24

.

Question 25

In general, fuel drain checks should be carried out, prior to the flight of the day, following each and any time may have occurred.

Answer 25

.

Question 26

During refuelling, bonding clips between the fuelling equipment and aircraft should be secured (before / after) the tank caps are removed.

Answer 26

.

Question 27

After refuelling, it is important that the documentation is completed.

Answer 27

.

Question 28

A dipstick from one aircraft (may / may not) be used to accurately check the fuel contents of another.

Answer 28

.

Question 29

If a fuel tank cap is left off, the fuel (may / will not) siphon out very rapidly in flight due to the (high / low) pressure over the wings.

Answer 29

.

Question 30

Fuel management (is / is not) a high priority for a pilot.

Answer 30

.