Fuel System

Question 1

How many fuel tanks?

Answer 1

2 (1 each wing)

Question 2

What is the purpose of the collector tank?

Answer 2

Keeps fuel pumps submerged to ensure constant fuel flow to respective engine

Question 3

Max fuel quantity?

Answer 3

20,935 lbs.

Question 4

Fuel low level warning?

Answer 4

660 lbs. in each tank

Question 5

Fuel temperature taken from which tank?

Answer 5

Left wing tank

Question 6

Minimum fuel temp?

Answer 6

-40 C

Question 7

How many fuel pumps?

Answer 7

13 total

• 2 engine driven
• 2 ejector
• 6 scavenge
• 2 AC electric
• 1 DC electric

Question 8

Engine driven pump

Answer 8

Primary fuel source to engine

• Provides motive flow to primary ejector pump
• Provides the pressure for motive flow to scavenge pumps

Question 9

Where are the ejector pumps located?

Answer 9

Collector tanks

Question 10

Purpose of scavenge pumps?

Answer 10

Maintain adequate fuel level in collector tank

Question 11

Purpose of AC fuel pumps?

Answer 11

Backup for ejector pumps

Used during cross feed operations

AC pump 2 provides fuel to APU when engine driven pump (EDP 2) is not running

Question 12

What provides fuel to APU when EDP 2 is not running?

Answer 12

AC Pump 2

Question 13

Where is the DC fuel pump installed?

Answer 13

The right wing

Question 14

What is the purpose of the DC fuel pump?

Answer 14

Provides pressurized fuel for normal APU start when AC power or the AC fuel pump 2 is not available

Question 15

Fuel cross feed

Answer 15

Allows fuel to both engines from one tank & used to correct fuel imbalance

Question 16

Max fuel imbalance?

Answer 16

794 lbs

EICAS message appears at 800 lbs.

Question 17

When does the EICAS fuel imbalance message disappear?

Answer 17

Fuel is within 100 lbs balanced

Question 18

XFEED Knob

-LOW 1

Answer 18

Right wing tank electric pump turns ON and X-FEED valve opens

Question 19

XFEED Knob

-LOW 2

Answer 19

Left wing tank electric pump turns ON and X-FEED valve opens

Question 20

What closes the engine fuel shutoff valves?

Answer 20

Fire handles

Question 21

Refueling

Answer 21

Pressure refueling or over wing gravity refueling

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Question 22

Where is the fuel temperature taken?

Answer 22

Left tank

Question 23

Fuel pumps in each wing?

Answer 23

• Primary ejector pump
• ACMP
• DCMP (right tank)
• 3 scavenge ejector pumps

Question 24

Pupose of ACMP?

Answer 24

• Back-up in case of primary ejector pump failure
• Engine start
• Cross Feed operations

Question 25

Purpose of DCMP?

Answer 25

Used for APU or engine start if AC power or the ACMP not available

Question 26

Purpose of scavenge pumps?

Answer 26

Maintains fuel level in collector box

Question 27

What pumps are used once the engine is started?

Answer 27

Associated primary ejector pump

Question 28

Purpose of the collector box?

Answer 28

Keeps the fuel pumps submerged and ensures constant fuel flow to respective engine

Question 29

What is the surge/vent tank?

Answer 29

Collects fuel during wing down maneuvers and returns it to the main tank. Also equalizes tank pressure with atmosphere in flight and during refueling

Question 30

Can fuel be transferred from tank to tank or dumped overboard?

Answer 30

No

Question 31

What happens when the cross feed switch is selected to LOW 1?

Answer 31

Cross feed valve is opened, commands the ACMP 2 pump ON to provide fuel from right tank to both engines

Question 32

When will the FUEL 1(2) LO LEVEL EICAS be presented?

Answer 32

660 lbs of fuel remaining in the associated tank