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747-400 FAULT ISOLATION/MAINT MANUAL

AFT NO. 2 OR NO. 3 MAIN TANK FUEL BOOST PUMP
AND AFT NO. 2 OR NO. 3 MAIN TANK WATER SCAVENGE EJECTOR PUMP

FUEL BOOST PUMP

FORWARD NO. 2 OR NO. 3 MAIN TANK FUEL BOOST PUMP
AND FORWARD NO. 2 OR NO. 3 MAIN TANK WATER SCAVENGE EJECTOR PUMP

Engine Fuel Feed System - Component Location (Details from Sht 1)
Figure 102 (Sheet 3)

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747-400 FAULT ISOLATION/MAINT MANUAL 
INLET  TO THE EJECTOR PUMP  VALVE CHECK  OUTLET 
SWITCH PRESSURE 
CHECK VALVE REMOVAL 

FUEL BOOST PUMP 
MOTOR/IMPELLER UNIT 
FRONT SPAR 
(REF) 
FUEL BOOST 
PUMP HOUSING ____NOTE:  FRONT SPAR LOCATION 
IS SHOWN;  REAR SPAR 
LOCATION IS ALMOST 
THE SAME 
FUEL BOOST PUMP 
F  FWD 
TO BOOST PUMP 

WATER SCAVENGE EJECTOR PUMP INLET SCREEN
WATER
SCAVENGE
EJECTOR
PUMP

BOOST PUMP INLET SCREEN
WATER SCAVENGE EJECTOR PUMP
G
Engine Fuel Feed System - Component Location (Details from Shts 2 and 3) Figure 102 (Sheet 4)
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747-400 FAULT ISOLATION/MAINT MANUAL
BOOST PUMP BYPASS VALVE
H BOOST PUMP BYPASS VALVE BOOST PUMP BYPASS PICKUP  TUBING MANIFOLD CROSSFEED  CENTER WING TANK REAR SPAR (REF) 
TUBING MANIFOLD CROSSFEED 
VALVE BODY 
I FUEL FLOW LIMITING VALVE 

Engine Fuel Feed System - Component Location (Details From Sht 1)
Figure 102 (Sheet 5)

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747-400
FAULT ISOLATION/MAINT MANUAL

FUEL MANAGEMENT CONTROL MODULE, M154
SEE J
MAIN POWER DISTRIBUTION PANEL, P6
FUEL CONTROL SWITCHES
SEE K
LEFT AND RIGHT 
NO. 1 AND NO.2  CENTER WING TANK  N0. 3 AND NO. 4 FUEL 
FUEL CROSSFEED  OVERRIDE/JETTISON  CROSSFEED VALVE SWITCHES, 
VALVE SWITCHES,  PUMP SWITCHES,  S11 AND S12 
S9 AND S10  S18 AND S19 

AFT AND FORWARD N0. 1 MAIN TANK FUEL BOOST PUMP SWITCHES, S5 AND S1
LOW PRESSURE INDICATION LIGHT (REF)
AFT AND FORWARD N0. 4 MAIN TANK FUEL AFT AND FORWARD N0. 2 BOOST PUMP SWITCHES,
AFT AND FORWARD N0. 3 MAIN TANK FUEL
MAIN TANK FUEL S8 AND S4 BOOST PUMP SWITCHES,
BOOST PUMP SWITCHES, S6 AND S2
S7 AND S3
FUEL MANAGEMENT CONTROL MODULE, M154
J
NO. 1 FUEL  NO. 2 FUEL  NO. 3 FUEL  NO. 4 FUEL 
CONTROL SWITCH,CONTROL SWITCH,  CONTROL SWITCH,CONTROL SWITCH, 
S211  S212  S213  S214 
FUEL CONTROL SWITCHES 
K 

Engine Fuel Feed System - Component Location
Figure 102 (Sheet 6)

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747-400
FAULT ISOLATION/MAINT MANUAL

CARD LOCATION PLACARD 
　
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