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 TABLE I
 D. Close the Removal Valve for the Applicable Boost Pump
 S 014-007
 (1)  Remove the access panels for the boost pumps in the applicable fuel tank (AMM 57-30-11/401).
 S 864-009
 CAUTION: MAKE SURE YOU CLOSE THE REMOVAL VALVES FOR THE BOOST PUMPS FOR
_______ THE APPLICABLE TANK. UNWANTED FUEL FLOW CAN OCCUR WHEN YOU REMOVE THE LOW PRESSURE SWITCH.
 (2)  Close the removal valves for the boost pumps in the applicable tank.
 E. Remove the Low Pressure Switch (Fig. 401)
 S 034-010
 (1)  
Disconnect the electrical connector from the low pressure switch (Fig. 401).

 S 494-011

 (2)  
Put a small container below the low pressure switch to catch fuel leakage.

 (3)  
Remove the low pressure switch.

 S 024-012
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 ALL  ú ú 01 Page 403 ú Jul 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
FRONT SPAR
BOOST PUMP FUEL LOW PRESSURE SWITCHES
SEE A
SEE C  FRONT SPAR
SEE B
FWD
O-RING
(LEFT WING SHOWN, RIGHT WING OPPOSITE)
A
TANK 1 OR 2 FWD BOOST PUMP AND
FRONT SPAR CENTER TANK LEFT OR RIGHT BOOST PUMP FUEL LOW PRESSURE SWITCH
O-RING  B
TANK 1 OR 2 AFT BOOST PUMP FUEL LOW PRESSURE SWITCH
C
Fuel Low Pressure Switch Installation Figure 401
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 28-42-11
 ALL  ú ú 01 Page 404 ú Mar 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 034-022
 (4)  Discard the O-ring.
 TASK 28-42-11-404-013
 3.  Fuel Feed Low Pressure Switch Installation (Fig. 401)__________________________________________
 A. References
 (1)  
AMM 27-81-00/201, Leading Edge Flaps

 (2)  
AMM 57-30-11/401, Fuel Boost Pump Access Panels

 B. Access
 (1)  
Location Zone
 303 Left Wing Inboard Leading Edge
 305 Left Fuel Tank
 403 Right Wing Inboard Leading Edge
 405 Right Fuel Tank

 (2)  
Access Panels
 7201 Boost Pump Access Door
 7203 Boost Pump Access Door
 7401 Boost Pump Access Door
 7403 Boost Pump Access Door

 

 C. Installation Procedure
 S 434-023
 (1)  
Install a new O-ring on the low pressure switch to be installed.

 S 424-014

 (2)  
Install the low pressure switch in the front spar.

 S 434-015

 (3)
Connect the electrical connector to the low pressure switch.

 NOTE: If the electrical connectors do not engage correctly,
____ make sure the low pressure switch has the correct part number. The electrical connector for the switches in the center tank is different from the electrical connector for the switches in the wing tanks.
 D. Put the Airplane Back to Its Usual Condition
 S 864-016
 (1)  If you did the procedure: "Close the Boost Pump Removal Valves in the Applicable Tank", do these steps:
 (a)  
Open the removal valves for the boost pumps in the applicable fuel tank.

 (b)  
Close the access panels for the fuel boost pumps (AMM 57-30-11/401).

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 ALL  ú ú 02 Page 405 ú Mar 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 094-017 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE
_______ LE FLAP SAFETY LOCKS. THE LE FLAPS CAN MOVE QUICKLY IF YOU DO NOT REMOVE THE SAFETY LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
　
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