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 ALL  ú ú 02 Page 506 ú Oct 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
E25026
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747-400 MAINTENANCE MANUAL
 ENGINE FUEL FEED SYSTEM - DESCRIPTION AND OPERATION
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 1.  General
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 A.  The engine fuel feed system works in conjunction with the fuel management system to deliver fuel from the tanks to the engines and to maintain proper fuel balance during flight. The system is designed to supply fuel to the engines at all airplane altitudes. The system consists of four main tank-to-engine subsystems, which are interconnected by crossfeed valves and crossfeed lines. Fuel may be delivered from any main tank or center wing tank to any or all engines.
 B.  Each main tank-to-engine subsystem delivers fuel from one main tank to its respective engine. Each subsystem is equipped with an engine fuel shutoff valve, an engine crossfeed valve, and two ac-powered fuel boost pumps. The pumps in each subsystem are controlled by separate switches and power sources so fuel supplied to the engine will not be disrupted by failure of a single power source or failure of one pump. An ejector pump at each boost pump inlet scavenges water from the low area of each main tank when the boost pump is operating. In addition, each engine fuel feed subsystem is provided with a boost pump bypass valve to allow suction feed to the engine in case of boost pump failure.
 C.  Override/jettison pumps, installed in the center wing tank and inboard main tanks, override the main tank boost pumps and supply fuel to any or all engines when the applicable crossfeed valves are open. Refer to 28-31-00/001 for description of override/jettison pumps.
 D.  The reserve tanks are not connected to a fuel feed manifold. Fuel from the reserve tanks is fed by gravity to the inboard main tanks by means of transfer valves. Refer to 28-16-00/001 for description of reserve tank transfer system.
 E.  The engine fuel feed system is controlled by switches on the fuel management control module on the P5 pilots' overhead panel and by control cards in the fuel management system. Power to the system is 115 volts ac and 28 volts dc, for the pumps and valves respectively.
 2.  Engine Fuel Feed Manifold (Fig. 1)
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 A.  The engine fuel feed manifold is used to distribute fuel from the boost pumps to the engines. The manifold is installed inside the fuel tanks and is secured in place with clamps and support brackets. The fuel feed manifolds in the left and right wings are interconnected by a crossfeed manifold installed along the rear spar inside the center wing tank. Fuel can be directed through the use of engine fuel crossfeed valves, to any or all engines from any main tank or tanks, or center wing tank.
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 28-22-00
 ALL  ú ú 03 Page 1 ú Jun 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
INBOARD MAIN TANK OVERRIDE/JETTISON PUMPS CENTER WING TANK
OVERRIDE/JETTISON  (REF 28-31-00) 
PUMPS  NO. 1 MAIN  BOOST PUMP 
(REF 28-31-00)  BOOST PUMPS  BYPASS VALVE 
AND EJECTOR PUMPS  NO. 1 ENGINE 
SEE  B  SEE  H  FUEL SHUTOFF 
FUEL FLOW  VALVE 
LIMITING VALVE  SEE  A 
SEE  I 

BOOST PUMP BYPASS VALVE
SEE H NO. 1 FUEL
NO. 2 AFT BOOST PUMP CROSSFEED VALVE
AND EJECTOR PUMP SEE ANO. 2 FORWARD SEE D
BOOST PUMP AND EJECTOR PUMP
NOTE:LEFT WING SHOWN, SEE E NO. 2 FUEL RIGHT WING OPPOSITE.
NO. 2 ENGINE FUEL
SHUTOFF VALVE
CROSSFEED VALVE
SEE A
SEE A
ADAPTER PLATE
FUEL FWD
TUBING ELECTRICAL CONNECTOR
ADAPTER SHAFT VALVE BODY FOR THE ENGINE FUEL SHUTOFF VALVE
MOTOR
ADAPTER SHAFT
ACTUATOR
FRONT SPAR
ENGINE FUEL SHUTOFF VALVE AND FUEL CROSSFEED VALVE
VALVE BODY
(EXAMPLE)
FOR THE FUEL
(INBOARD INSTALLATION SHOWN)
WET SIDE OF CROSSFEED THE FRONT SPAR
VALVE
A1 FWD
ENGINE FUEL SHUTOFF VALVE AND FUEL CROSSFEED VALVE
1
ENGINE NO. 2 AND 3 SHOWN
(EXAMPLE)
ENGINE NO. 1 AND 4 FUEL SHUTOFF
(INBOARD INSTALLATION SHOWN)
VALVE ACTUATOR, ADAPTER PLATE/ SHAFT AND VALVE BODY ARE INSTALLED
A
UPSIDE DOWN (ROTATED 180`)
　
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