170 Fuel

2 integral tanks

Left tank

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

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

• Powered by motive flow

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

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

Maintains fuel level in the collector box

Associated primary ejector pump

Associated primary ejector pump

• Keeps the fuel pumps submerged

• Ensures constant fuel flow to the respective engine

• • 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

no

• Crossfeed valve is opened

• Commands the ACMP 2 to ‘ON’ to provide fuel from the right tank to both engines

Pull the associated engine fire extinguishing handle

660 lbs of fuel remaining in the associated tank

Leaves fuel tank and divides into two paths.

One flows through the low-pressure pump and then returns to the fuel tank as motive flow.

The second flows through the fuel/oil heat exchanger to the fuel filter. Then flows to the Fuel Metering Unit and passes through the high pressure pump and back to the FMU.

The FMU sends the fuel to the injectors or the CVGs.