Fuel System

Question 1

Fuel Quantities in each tank and totals?

Answer 1

Wing Tanks (1 & 2) 1,499 Gallons / 10,043 LBS

Center Tank 2313 Gallons / 15,497 LBS

Total 5311 Gallons / 35,583 LBS

Question 2

Prohibited fuels?

Answer 2

JP-4 and Jet B are prohibited

Question 3

What powers

• FUEL SHUTOFF VALVES?
• Crossfeed valve?

Answer 3

• DC power from Hot battery bus

- DC power from battery bus

Question 4

Fuel temp sensor location

Answer 4

main tank #1

Question 5

Max fuel temp / min fuel temp

Answer 5

MAX is 49C

Min is 3 deg C above fuel freezing or 45 deg C whichever is higher

Question 6

What powers fuel boost pumps?

Answer 6

“AC Power”

AFT pumps are Transfer bus 1/2 (for a/b)

FWD pumps are GEN bus 1/2 (for a/b)

Question 7

If AC power is lost in flight which fuel tank will have trapped fuel that cannot be suction fed to engines?

Answer 7

Center Tank

Question 8

Main difference between how Center and Main tank fuel pump lights function?

Answer 8

When center tank pumps are off,, lights go out

Question 9

How does LOW PRESSURE fuel light illuminate MASTER CAUTION?

Answer 9

TWO in same tank to light master caution

ONE only will only illuminate MC only if recall is pushed

Question 10

Fuel Quantity indicators powered by

Answer 10

Standby AC power

Question 11

Why does Center tank fuel get used first?

Answer 11

Valves open at lower pressure than main tanks

Question 12

Center tank scavenge pump

Answer 12

When both center tank pumps are turned off, fuel scavenge shutoff valve opens and allows fuel pressure from main tank #1 FWD pump to operate scavenge jet pump for next 20 minutes.

Question 13

Fuel vent system

Answer 13

Prevents damage to wings and provides ram air pressure within the main tanks. Main tanks are vented into surge tanks in wing through a single opening in wing.

Question 14

APU fuel is supplied from

Answer 14

Left side of the fuel manifold. Either turn on 1 pump or APU will suction feed from main tank 1