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EFFECTIVITY
GUN ALL 73-11-00
Page 2
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-11-00-003
ENGINE FUEL AND CONTROL - DISTRIBUTION - INTRODUCTION
ENGINE FUEL AND CONTROL - DISTRIBUTION - INTRODUCTION
EFFECTIVITY
GUN ALL PRE SB CFM56-7B 73-44 73-11-00
Page 3
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-11-00-003
ENGINE FUEL AND CONTROL - DISTRIBUTION - INTRODUCTION
ENGINE FUEL AND CONTROL - DISTRIBUTION - INTRODUCTION
EFFECTIVITY
GUN ALL POST SB CFM56-7B 73-44 73-11-00
Page 4
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-11-00-003
General
The engine fuel pump assembly receives fuel from the airplane
fuel system.
The fuel pump assembly supplies pressurized fuel to the servo
and metering sections of the HMU. The fuel filter in the pump
cleans the fuel that goes to the HMU.
These units heat the fuel before it goes to the HMU:
* IDG oil cooler
* Oil/fuel heat exchanger
* Servo fuel heater.
Fuel goes from the fuel pump to the IDG oil cooler, then to the
oil/fuel heat exchanger. From the oil/fuel heat exchanger, the
fuel goes back to the fuel pump assembly. This fuel becomes
high pressure fuel. This high pressure fuel goes to the HMU.
Part of the high pressure fuel goes through the servo fuel heater
before it goes to the HMU. The other part of the high pressure
fuel becomes metered fuel in the HMU.
The fuel pump always supplies more fuel to the HMU than the
HMU can use. The fuel that the HMU does not use (bypass fuel)
goes back to the outlet of the integrated drive generator (IDG)
oil cooler. This fuel returns to the fuel pump.
Metered fuel goes through the fuel flow transmitter.
From the fuel flow transmitter, metered fuel goes through the
fuel nozzle filter.
GUN ALL PRE SB CFM56-7B 73-44
Fuel goes from the fuel nozzle filter to the unstaged fuel nozzles
and to the burner staging valve (BSV). When the BSV opens,
fuel goes to the staged fuel nozzles. The unstaged and staged
fuel nozzles supply atomized fuel to the engine combustion
chamber.
GUN ALL POST SB CFM56-7B 73-44
Fuel goes from the fuel nozzle filter to the fuel nozzles. The fuel
nozzles supply atomized fuel to the engine combustion
chamber.
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ENGINE FUEL AND CONTROL - DISTRIBUTION - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL 73-11-00
Page 6
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-11-00-004
ENGINE FUEL AND CONTROL - DISTRIBUTION - GENERAL DESCRIPTION
ENGINE FUEL AND CONTROL - DISTRIBUTION - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL PRE SB CFM56-7B 73-44 73-11-00
Page 7
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-11-00-004
ENGINE FUEL AND CONTROL - DISTRIBUTION - GENERAL DESCRIPTION
ENGINE FUEL AND CONTROL - DISTRIBUTION - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL POST SB CFM56-7B 73-44 73-11-00
Page 8
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-11-00-004
General
These are the engine fuel distribution system components:
* Fuel nozzle filter
* Fuel pump assembly
* Fuel filter
* IDG oil cooler
* Servo fuel heater
GUN ALL PRE SB CFM56-7B 73-44
* Burner staging valve (BSV)
GUN ALL
* Fuel manifolds
* Fuel nozzles.
Component Locations
The fuel nozzle filter is near the top of the engine fan case at the
10:00 position.
The fuel pump assembly attaches to the aft face of the
accessory gearbox (AGB) on the left side of the engine fan case.
The fuel filter is a part of the fuel pump assembly.
The IDG oil cooler attaches at the rear of the fan frame at the
7:00 position.
The servo fuel heater attaches to the main oil/fuel heat
exchanger, which attaches to the top of the fuel pump
assembly. See the engine oil chapter for more information
about the main oil/fuel heat exchanger. (SECTION 79-20)
　
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