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 2) If you see water in the fuel, continue to sump the tank until you remove all of the water. 3) If you see red dye in the fuel, do this task: Fuel Tanks Contaminated with Red Dye (AMM 28-11-00/701). 4) If you see other contamination, do these steps: a) Clean the fuel sampling equipment with isopropyl alcohol and dry completely. b) With a sterilized glass container, get another sample of fuel. 5) Do this task: Do a Detection Check for Contamination with Microbes or Fungus (AMM 28-11-00/701).
 (b)  
Remove the hose.

 (c)  
Close the access door for the sump drain valve.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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

THE CENTER TANK
Sump Drain Valve for the Center Tank
Figure 303 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
M50368
A 737-300/400/500MAINTENANCE MANUAL
SUMP DRAIN PANEL IN THE

SUMP DRAIN SLOT-TYPE
VALVE FOR THE CENTER
BLADE TANK
SUMP DRAIN ASSEMBLY CONTAINER

DRAIN TOOL FOR THE CENTER TANK SUMP
RETAINING
PLATE

SUMP DRAIN
TURN & PUSH TO DRAIN
RELEASE TO CLOSE
SLOT POSITION TO BE FORE
& AFT FOR CLOSED & LOCKED

SUMP DRAIN VALVE FOR THE CENTER TANK DRAIN TOOL FOR THE(TOOL OPERATED) CENTER TANK SUMP

A

B
Sump Drain Valve for the Center Tank Figure 303 (Sheet 2)
M50374
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 DRAIN VALVE  ú
 ú 01A ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 310Mar 12/02 

A
737-300/400/500MAINTENANCE MANUAL
SUMP DRAIN VALVE  FLAPPER ASSEMBLY 
PANEL IN THE BOTTOM WING SKIN 

PLUNGER
TOP HOUSING
VALVE ACTUATING CAM
DRAIN TUBE ASSEMBLY
SUMP DRAIN ASSEMBLY
ACTUATING ROD
ACTUATING ROD
RETAINING PLATE
A
A
DRAIN TUBE
DOOR ACCESS DOORBOTTOM BODY FASTENER
SKIN SEE C
SUMP DRAIN VALVE FOR THE CENTER TANK (ROD-OPERATED)
A
Sump Drain Valve for the Center Tank Figure 303 (Sheet 3)
FWD
SUMP DRAIN
ACCESS DOOR
A-A
SUMP DRAIN
PULL TO DRAIN.
RELEASE TO CLOSE.
VERIFY THAT HANDLE
RETURNS TO CLOSED
POSITION.
ACCESS DOOR
A

M50430
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 DRAIN VALVE  ú
 ú  01A  Page 311
 ú  Mar 12/02 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 PRESSURE REFUELING - SERVICING
______________________________
 1.  General_______
 A.  This procedure has this task:
 (1) A task to refuel the airplane with the pressure refuel procedure
 B.  You can refuel the No. 1 tank and the No. 2 tank with the pressure refuel procedure. You can refuel the center tank with the pressure refuel procedure. You can also move fuel from the other tanks into the center tank with the fuel boost pumps. You must use this procedure to put fuel in the center tank if you used the overwing refuel procedure for the other tanks.
 C.  It is necessary to have 115-volt ac power to use the boost pumps. Refer to Fig. 301 for the location of the pressure refuel station. Use the pressure refuel procedure when it is possible to use it because it has these properties:
　
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