28-15-11
 ALL  ú ú 01 Page 401 ú Jul 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

FUEL BOOST 
FUEL SCAVENGE  PUMP (REF) 
FLOW INDICATOR/ 
CHECK VALVE  1 
FUEL SCAVENGE 
JET PUMP 
FUEL SCAVENGE  SEE  A 
SHUTOFF VALVE 
(REF) 
ENGINE SHUTOFF 
VALVE (REF) 
CENTER TANK 

FLAPPER
TANK NO. 1
CHECK VALVE (REF) 2
FUEL SCAVENGE JET PUMP
O-RING
FUEL SCAVENGE
FLOW INDICATOR/
CHECK VALVE

WASHER 1
NUT
O-RING LOCKWIRE
FRONT SPAR
WASHER

FLOW INDICATOR/ CHECK VALVE CAP
NUT FWD
A
1
NOT ON ALL AIRPLANES
2
NOT ON AIRPLANES WITHOUT FUEL FLOW
INDICATOR/CHECK VALVE

Fuel Scavenge Jet Pump Installation
Figure 401

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 28-15-11
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
 S 654-005
 WARNING: CAREFULLY DO ALL THE SAFETY PROCEDURES TO DEFUEL THE TANK AND
_______ TO GO INTO IT. INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR IF YOU DO NOT OBEY THE SAFETY PROCEDURES.
 (4)  
Defuel the No. 1 tank and prepare to go into it (AMM 28-23-00/201, AMM 28-10-00/201).

 S 014-006

 (5)  
Remove the No. 1 access panel (7202) for the No. 1 fuel tank (AMM 28-11-11/401).

 D. Jet Pump Removal Procedure
 S 034-007
 (1)  
Remove the nut and the washer that attach the jet pump to the front spar.

 S 024-008

 (2)  
Remove the jet pump from the No. 1 tank.

 (a)  
Go into the No. 1 tank to get access to the jet pump.

 (b)  
Disconnect the fuel lines from the jet pump.

 (c)  
Remove the jet pump from the tank.

 (d)  
Discard the O-ring.

 TASK 28-15-11-404-009
 3. Fuel Scavenge Jet Pump Installation (Fig. 401)
___________________________________
 A. Consumable Materials
 (1)  B00316 - Aliphatic Naptha TT-N-95
 B. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 27-81-00/201, Leading Edge Flaps

 (3)  
AMM 28-11-11/401, Wing Fuel Tank Access Panels

 C. Access
 (1)  Location Zones
 303 Left Wing Leading Edge
 305 Left Fuel Tank

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737-300/400/500MAINTENANCE MANUAL
 (2)  Access Panels
 7202 Fuel Tank Access Door

 D. Installation Procedure
 S 114-010
 (1)  Clean these surfaces with the aliphatic naphtha and dry them with a lintfree cloth:
 (a)  
The O-ring groove in the body of the jet pump

 (b)  
The mating surface for the body of the jet pump in the No. 1 tank.

 S 434-011
 (2)  
Install a new O-ring, lightly lubricated with fuel, in the groove in the jet pump.

 S 424-012

 (3)  
Install the jet pump in the correct position.

 (a)  
Put the jet pump in its correct position through the hole in the front spar.

 (b)  
Attach the jet pump to the correct position with the washer and the nut.

 S 434-013
 (4)  Connect the fuel lines to the jet pump.
 E. Put the Airplane Back to Its Usual Condition
 S 414-014
 (1)  Install the No. 1 access panel (7202) that you removed to get access to the jet pump (AMM 28-11-11/401).
 S 094-015
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE
　
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