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 9.  Fuel Lines and Couplings
________________________
 A.  The lines that transfer fuel from the tanks to the engine are fabricated from seamless aluminum alloy tubing, and are connected to the various fuel system components by standard unions, couplings or flanges. Bonding jumpers are used to ensure positive electrical grounding of the tubing and fittings to the airplane structure. The lines in the wings are mainly located inside the fuel tank boundaries.
 B.  The APU fuel line segment from the center tank fitting to the bulkhead connection on the APU shroud is mainly a flexible hose enclosed in a metal fuel line shroud. The fuel line continues from the APU shroud to the APU fuel control but is not separately shrouded for this distance.
 10. Operation (Fig. 2 and Fig. 3)
_________
 A.  The engine fuel feed system will supply fuel to the engines by a direct tank-to-engine feed or from any tank to either or both engines through the crossfeed valve when the boost pumps are operating. To obtain direct tank-to-engine feed, the fuel crossfeed valve is closed, the engine fuel shutoff valves are opened. For crossfeed, the fuel crossfeed valve and the engine fuel shutoff valves are opened and the applicable boost pumps are operated.
 B.  The engine fuel shutoff and crossfeed valves are operated by 28 volt dc motors. Control of the crossfeed valve is by a switch on fuel system module (P5 panel). The engine fuel shutoff valves will close when the fire switches are placed in FIRE position. Normal shutoff valve control is with the engine start lever (In cutoff, valve is closed. In idle, valve is open).
 C.  The center tank boost pumps override tanks No. 1 and 2 boost pumps since pressure from tanks No. 1 and 2 tank boost pumps has to overcome a boost pump check valve cracking pressure of 12 psi, while center tank boost pumps have only a 1.3 psi check valve cracking pressure to overcome.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
TO OTHER TANKS BOOST PUMP SWITCH

 

 

115V AC
28V DC
BOOST PUMP SWITCH  RELAY
TYPICAL CIRCUIT FOR ONE BOOST PUMP IN A GIVEN TANK. OTHER BOOST PUMP CIRCUIT SAME BUT WITH SEPARATE SOURCE OF POWER AS SHOWN IN TABLE BELOW
FUEL SCAVENGE SYSTEM (REF 28-15-00)

BOOST PUMP POWER SOURCE 
TANK FUEL  28V DC BUS NO.  115V DC BUS NO. 
1  2  BUS NO. 1 TRANSFER  1  2  BUS NO. 2 TRANSFER 
1  PUMP AFT  FWD PUMP  PUMP AFT  FWD PUMP 
2  FWD PUMP  PUMP AFT  FWD PUMP  PUMP AFT 
CENTER  PUMP LEFT  PUMP RIGHT  PUMP RIGHT  PUMP LEFT 

Engine Fuel Feed System Schematic
Figure 2 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
C314
FUEL SHUTOFF
VALVE INDICATION

B
CROSSFEED VALVE

C361 START
B
C360

28V DC
BAT BUS
CUTOFF
ENG 2

SHUTOFF VALVE
L2 ENG 2 FUEL VALVE
S596 ENG 2 START
CLOSED LIGHT
LEVER SWITCH
C359
SHUTOFF VALVE

OPEN ENG 1
28V DC
HOT BAT BUS

NORMAL
M
C169SW HOT BAT BUS CLOSED
FIRE
S9 ENG 2V38 ENG 2 FUELFIRE SW SHUTOFF VALVER41 GEN POWERP8-1 ENG & APU FIRE
CONTROL RLYCONTROL PANEL
B
P6-3 CIRCUIT BREAKER PANEL B
L1L3 L2L3 CROSSFEED VALVEOPEN LIGHT
FUEL VALVE FUEL VALVECLOSED
CLOSED
0 -20 FUELTEMP
+20
CLOSE
-40 +40
CLOSED
`C
M
NO
C
FILTERVALVEFILTER
NC
BYPASS OPEN BYPASS
OPEN ENG START
OPEN
CROSS FEED
LEVERS S596 S3
V39 FUELCROSSFEED
CROSSFEED VALVECONT SW CONTROL
B
STAND
FUEL SHUTOFF VALVE CAM
B

SWITCH ACTUATOR ARM S3 S595
L1 ENG 2 FUEL VALVECLOSED LIGHT START OPEN
NORMAL
M CUTOFF FIRE
CLOSE S8 ENG 1 S595 ENG 1 START
　
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