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737-300/400/500MAINTENANCE MANUAL
 PRESSURE FUELING SYSTEM - DESCRIPTION AND OPERATION
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General (Fig. 1)
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 A.  The pressure fueling system supplies a fast procedure to fill the fuel tanks in the airplane.
 B.  The refuel station, found on the right wing leading edge, has a refuel panel, fueling receptacle manifold, fueling power control switch, and a fueling receptacle. Three panel lights are installed, one on each side of the control panel and one outboard of the fueling receptacle, to supply lighting for the fueling bay.
 C.  Pressure fueling shutoff valves are installed between the fueling manifold and its branch lines. The branch lines direct fuel into each fuel tank. The pressure fueling shutoff valves control the flow of fuel from the fueling manifold to its branch lines. A defueling valve (Ref 28-23-00/001) connects the engine fuel feed manifold with the pressure fueling manifold.
 D.  The refuel panel (P15) controls the fueling system. The refuel panel has all the switches and indicators necessary to do the refuel operation.
 E.  Each fuel tank has a fueling float switch to supply automatic fueling shutoff when the tank is full. The refuel quantity indicators are used to fill the fuel tanks to a predetermined level when a full fuel load is not necessary.
Fueling Shutoff Valve
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 A.  Fueling shutoff valves are installed in the fueling receptacle manifold to control fuel distribution to the fuel tanks during the refuel operation. Each valve is an electric, solenoid-actuated, shutoff valve. The fueling shutoff valve is spring-loaded to the closed position with a manual override pushbutton. The manual override pushbutton on the valve solenoid supplies a manual procedure to open the fueling shutoff valve when it is not energized.
 B.  The fueling shutoff valves are operated on 28v dc power and are controlled by the fueling float switch when a full tank is sensed, or by individual switches on the refuel panel for fueling control at any fuel level. Valve position lights installed on the refuel panel come on when the valve solenoid is energized.
Fueling Receptacle (Fig. 1)
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 A.  A single fueling receptacle, installed on a manifold on the forward face of the wing front spar, connects the fueling hose to the pressure fueling system. The receptacle has a fueling hose adapter connected to the fueling receptacle manifold and a cap and a spring-loaded valve. The fueling hose adapter has mating lugs which connect with and attach the fueling hose. When the fueling hose is connected to the fueling hose adapter, a plunger in the hose nozzle opens the spring-loaded valve to let fuel flow into the fuel tanks.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
FUELING FLOAT SWITCH FOR THE CENTER TANK
SEE C REFUEL STATION
FUELING FLOAT SWITCH 
SEE  A  FOR THE NO. 2 TANK 
(NO. 1 TANK OPPOSITE) 
FUELING  FUELING SHUTOFF 
SEE  B  RECEPTACLE  VALVE (3 LOCATIONS) 
MANIFOLD 

FUELING RECEPTACLE FUELING POWER CONTROL SWITCH
REFUEL PANEL (P15 PANEL)
SEE D
WING FUELING
LEADING FLOAT
EDGE SWITCH
ACCESS DOOR
FWD
PANEL LIGHTS
REFUEL STATION
A
FUELING FLOAT SWITCH
B
VALVE POSITION LIGHTS TEST GAGES &
bb b FUELING
TANK No.2 CENTER TANK TANK No.1 TEST GAGES OPEN OPEN OPEN
OFF
CLOSED CLOSED CLOSED AUX FUELING POWER CONTROL
FUELING FLOAT SWITCH
FUELING FLOAT SWITCH FOR THE CENTER TANK  REFUEL PANEL
C D
Pressure Fueling System Component Location Figure 1
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