E175 Fuel System

Question 1

How many fuel tanks does the airplane have?

Answer 1

2 integral tanks

Question 2

Where is the fuel tank temperature taken?

Answer 2

Left tank

Question 3

What types of fuel pumps are in each wing?

Answer 3

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

Question 4

What is the primary ejector pump?

Answer 4

• Venturi pump with no moving parts and no electrical power used by the respective engine
• powered by motive flow

Question 5

What is the purpose of the ACMP?

Answer 5

• backup pump in case primary ejector pump fails
• engine start
• xfeed operations

Question 6

What is the purpose of the DCMP?

Answer 6

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

Question 7

What is the purpose of the scavenge pumps?

Answer 7

Maintains fuel level in the collector box

Question 8

What pump(s) is used once an engine is started

Answer 8

Associated primary ejector pumps

Question 9

What is the purpose of the collector box?

Answer 9

• keeps the fuel pumps submerged

- ensures constant fuel flow to the respective engine

Question 10

What is the surge/vent tank?

Answer 10

• collects fuel during wing down maneuvers and returns it to the main tanks once the wings are level
• equalizes tank pressure with atmosphere in-flight and during refueling

Question 11

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

Answer 11

No. The only exception is by performing a maintenance function on the ground

Question 12

What happens when the xfeed switch is selected to LOW1?

Answer 12

• xfeed valve is opened

- commands the ACMP 2 to “on” to provide fuel from the right tank to both engines

Question 13

What is the only way to close the engine fuel SOV

Answer 13

Pull the associated engine fire extinguishing handle

Question 14

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

Answer 14

660 lbs of fuel remaining in the associated tank