2......................................…............…............…..............1

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
SUMP DRAIN 
SUMP DRAIN  VALVE FOR THE 
VALVE FOR THE  NO. 1 SURGE TANK 
NO. 1 MAIN TANK 
SUMP DRAIN 
VALVE FOR THE 
CENTER TANK 
DEFUELING 
VALVE 
SEE  A 
SUMP DRAIN 
VALVE FOR THE 
NO. 2 MAIN TANK 
SUMP DRAIN 
VALVE FOR THE 
NO. 2 SURGE TANK 

WING 
FRONT 
SPAR 
DEFUELING 
VALVE 
ACTUATING HANDLE 
(SHOWN IN THE 
CLOSED POSITION) 

DEFUELING VALVE
A

Defueling Valve and Fuel Sump Drain Valves Location
Figure 202

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 (a)  To operate the fuel boost pumps in the center tank, you must be in the flight compartment to continuously monitor for the LOW PRESSURE lights. 1) Turn the applicable fuel boost pump to the OFF position if
 the LOW PRESSURE light for the center tank stays on.
 S 652-027
 (17)
 Start the defueling pump on the refuel truck.

 S 652-028

 (18)
 Defuel the applicable tank until the fuel quantity indicator shows the specified quantity of fuel in the tank.

 (a)  
You can also defuel the tank until the applicable LOW PRESSURE light goes on.

 (b)  
Set the applicable boost pump switches to OFF.

 S 862-029
 (19) Close the crossfeed valve with the applicable switch on the P5 panel.
 (a)  
Make sure the position indication light for the crossfeed valve is bright when the valve position changes.

 (b)  
Make sure the position indication light goes off when the valve is closed.

 (c)  
P6 Main Power Distribution Panel
 1) FUEL CROSSFEED VALVE

 S 862-005
 (20)
 On the P5 panel, set the switch for the fuel crossfeed valve to CLOSE.

 (a)  
Make sure the position light is bright when the valve position changes.

 (b)  
Make sure the position light goes off when the valve is closed.

 (21)
 Stop the defueling pump on the fuel truck.

 S 862-031
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 412-006
 (22)
 Close the access door, 6535, for the defueling valve.

 S 862-032

 (23)
 Close the defueling valve.

 S 862-033

 (24)
 Close the fuel shutoff handle on the hose nozzle.

 S 092-007

 (25)
 Disconnect the nozzle of the defueling hose from the fueling receptacle.

 S 092-008

 (26)
 Disconnect the bonding jumper from the ground jack on the airplane if there is a bonding jumper.

 S 432-034

 (27)
 Put the cap on the fueling receptacle.

 S 412-009

 (28)
 Close the access door, 6540, for the refuel station.

 S 862-035

 (29)
 Remove the electrical power if it is not necessary for other tasks (AMM 24-22-00/201).
　
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