Fuel Systems Part 1

Question 1

In the pressure or pump feed system the auxiliary pump is an -

Answer 1

electrical pump

Question 2

The major role of the auxiliary pump(booster pump) is to supply fuel under pressure from the -

Answer 2

tanks to the engine.

Question 3

Under certain conditions fuel may vaporise within the fuel lines. This premature vaporisation may result in -

Answer 3

partial or complete interruption of the fuel flow

Question 4

The following conditions are conducive to vapour locks:

1. Lowering of the fuel _______, which causes the fuel to ___ at ______ and release air ______.
2. ____ fuel ____________. ____ fuel at take-off may easily ___ at altitude.
3. Excessive turbulence, where air is _____ with fuel and separation in the lines result in the formation of air ______

Answer 4

1. Lowering of the fuel pressure, which causes the fuel to boil at altitude and release air bubbles.
2. High fuel temperatures. Warm fuel at take-off may easily boil at altitude.
3. Excessive turbulence, where air is mixed with fuel and separation in the lines result in the formation of air pockets

Question 5

In the pressure or pump feed system, there are two pumps connected in parallel, these two pumps are?

Answer 5

an engine driven pump(EDP) and an electrical auxiliary pump

Question 6

Methods used in the prevention of vapour locks:

1. Fuel lines are kept ____ from sources of ____, especially in _________ sections.
2. Sharp _____ in fuel lines are avoided, thus reducing the possibility of fuel _________ in the lines
3. Volatility of the fuel is controlled by manufacturers so that it does not _______ easily.
4. Use of _______ pumps to _______ _______ on the fuel. _______ pumps (centrifugal) ______ vapour from the fuel where it moves upward through the tank and is ______

Answer 6

1. Fuel lines are kept away from sources of heat, especially in powerplant sections.
2. Sharp bends in fuel lines are avoided, thus reducing the possibility of fuel turbulence in the lines
3. Volatility of the fuel is controlled by manufacturers so that it does not vaporise easily.
4. Use of booster pumps to maintain pressure on the fuel. Booster pumps (centrifugal) release vapour from the fuel where it moves upward through the tank and is vented

Question 7

The types of fuel tanks used on most modern transport aircraft are:

Answer 7

Integral Tanks

Question 8

The pressure usually produced by the Boost Pumps (BP) of the fuel supply system is within the following range:

Answer 8

20 - 50 psi

Question 9

On a transport type aircraft the fuel tank system is vented through:

Answer 9

Ram air scoops on the underside of the wing.

Question 10

On most transport aircraft, the low pressure pumps of the fuel system are:

Answer 10

Centrifugal pumps

Question 11

Centrifugal pumps are powered by -

Answer 11

115v AC