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The HP fuel pump consists of two gearshafts, the drive and the driven gears.
The drive gear is driven, through splines, by the main drive shaft connected to the AGB.
Each gearshaft is supported by two plain bearings.
The fuel used to lubricate the LP stage equipment, is also used to lubricate the HP stage bearings and the lubricating fuel then flows back to the fuel filter inlet.

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CTC-201-284-01
EFFECTIVITY
73-11-10 Page 13
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
EFG FUEL PUMP  CFM56-5B  TRAINING MANUAL 
High pressure relief valve. 
The high pressure relief valve is installed in parallel with the gear stage pump, and consists of : 
- A relief valve housing. - A relief valve piston. - A spring. - An adjusting cap. 
When the differential fuel pressure between the inlet and the outlet of the gear stage reaches 1030 to 1070 psi, the valve opens. The relief valve recovery point is set between 990 and 1010 psid. 
The relief valve housing is threaded within the pump case. 
The relief valve piston is in contact with the housing through the spring force and the fuel pressure coming out of the filter. 
On the other side of the piston, the fuel pressure from the HP stage is applied to the end of the piston. 
The fuel goes back to the HP pump inlet when the relief valve is open. 
EFFECTIVITY ALL CFM56-5B ENGINES FOR A319-A320-A321 CFMI PROPRIETARY INFORMATION  73-11-10 ENGINE SYSTEMS  Page 14 Jan 03 

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CTC-201-092-02
EFFECTIVITY

73-11-10 Page 15
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
FUEL PUMP
The wash filter.

The wash filter, located at the fuel pump HP stage discharge, catches particles remaining in the fuel directed to the servo fuel heater.
The foreign particles, retained by the filter, are removed by the main fuel flow supplying the HMU.
The wash filter is incorporated with the fuel pump housing, and consists of a filtering element and a by-pass valve.
The by-pass valve opens if the filter becomes clogged.
The cartridge has a filtering capability of 65 microns.

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CTC-201-093-02
EFFECTIVITY
73-11-10 Page 17
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL

EFG
FUEL PUMP
Fuel filter
The fuel filter protects the downstream circuit from particles in the fuel.
It consists of a filter cartridge and a by-pass valve.
　
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