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 A fuel pump and filter assembly.

-A main oil/fuel heat exchanger
- A servo fuel heater.
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A Hydro-Mechanical Unit (HMU).

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A fuel flow transmitter

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A fuel nozzle filter

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 A Burner Staging Valve (BSV).

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 Two fuel manifolds.

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 Twenty fuel nozzles.

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 An IDG oil cooler.

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 A Fuel Return Valve (FRV).

EFG
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CTC-201-068-01  . 
EFFECTIVITY ALL CFM56-5B ENGINES FOR A319-A320-A321 CFMI PROPRIETARY INFORMATION
 73-11-00 ENGINE SYSTEMS  Page 5 Jan 03 

CFM56-5B TRAINING MANUAL
EFG
FUEL DISTRIBUTION
Fuel from the A/C tank enters the engine fuel pump, through a fuel supply line.
After passing through the pump, the pressurized fuel goes to the main oil/fuel heat exchanger in order to cool down the engine scavenge oil.
It then goes back to the fuel pump, where it is filtered, pressurized and split into two fuel flows.
The main fuel flow goes through the HMU metering system, the fuel flow transmitter and fuel nozzle filter and is then directed to the fuel nozzles and the BSV.
The other fuel flow goes to the servo fuel heater, which warms up the fuel to prevent any ice particles entering sensitive servo systems.
The heated fuel flow enters the HMU servo-mechanism and is then directed to the various fuel-actuated components.
A line brings unused fuel, from the HMU, back to the inlet of the main oil/fuel heat exchanger, through the IDG oil cooler.
A Fuel Return Valve (FRV), also installed on this line, may redirect some of this returning fuel back to the A/C tank.
Before returning to the A/C tank, the hot fuel is mixed with cold fuel from the outlet of the LP stage of the fuel pump.

EFG
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CTC-201-070-01
EFFECTIVITY
73-11-00 Page 7
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
THIS PAGE INTENTIONALLY LEFT BLANK

EFG
FUEL PUMP

EFFECTIVITY
73-11-10 Page 1
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
FUEL PUMP
The purpose of the engine fuel pump is :
-
 To increase the pressure of the fuel from the A/C fuel tanks, and to deliver this fuel in two different flows.

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 To deliver pressurized fuel to the main oil/fuel heat exchanger.
　
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