73-31-02
 SYSTEM (EIS)  ú
 ú  C02  Page 403
 ú  Mar 12/00 
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FUEL FILTER BYPASS WARNING SYSTEM - DESCRIPTION AND OPERATION
_____________________________________________________________
 1.  General
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 A.  The fuel filter bypass warning system provides an indication of an excessive pressure differential across the fuel filter.
 2.  Fuel Filter Differentail Pressure Switch (Fig. 1)
________________________________________
 A.  The fuel filter differential pressure switch is flange mounted to the fan case just above the upper drain line support block at the 7 o'clock position. Two flexible lines are connected between the switch and the fuel filter inlet pressure port and outlet pressure port on the fuel filter housing.
 3.  Filter Bypass Warning Light (Fig. 2)
___________________________
 A.  Two FILTER BYPASS warning lights, one for each engine, are located on the fuel module, on the pilot's forward overhead panel, P5-2. The FILTER BYPASS warning light will illuminate amber when the fuel filter is about to be bypassed.
 4.  Operation (Fig. 3)
_________
 A.  When blockage in the fuel filter causes the differential pressure to exceed 10.5-12.5 pounds per square inch (psi) the pressure switch closes. When the differential pressure decreases to less than 8.0-10.0 psi, the switch will open. Illumination of the FILTER BYPASS light does not necessarily indicate that bypass has occurred since the filter bypass valve will not open until 15 | 1 psig is reached.
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 73-34-00
 ALL  ú ú C01 Page 1 ú Feb 25/86
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEEA
MEC FUEL FILTER
FUEL OUTLET PRESSURE LINE
FUEL INLET PRESSURE LINE
FUEL FILTER DIFFERENTIAL PRESSURE SWITCH
D1006 ELECTRICAL CONNECTOR
1 BOLT, WASHER - AFTFWD 2 BOLTS, WASHERS, NUTS -FWD
A
Fuel Filter Differential Pressure Switch Location Figure 1
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 73-34-00
 ALL  ú ú C01 Page 2 ú Jun 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////

Fuel Filter Bypass Warning Light Location
Figure 2

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 73-34-00
 ALL  ú ú C01 Page 3 ú Jun 25/85
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////

ENGINE 1
(REF WD 73-34-00) (WD 75-13-11)
Fuel Filter Bypass Warning System Schematic Figure 3
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 73-34-00
 ALL  ú ú C01 Page 4 ú Jun 25/85
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
　
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