3. Install the Fuel Boost Pump Bypass Valve (Fig. 401)
________________________________________
 A. References
 (1)  
SWPM 20-20-00, Standard Wiring Practices Manual

 (2)  
AMM 28-11-11/401, Wing Tank Access Panels

 B. Access
 (1)  
Location Zones
 305 Left Fuel Tank
 405 Right Fuel Tank

 (2)  
Access Panels
 7202 Fuel Tank Access Door
 7402 Fuel Tank Access Door

 C. Install the Fuel Boost Pump Bypass Valve
 S 644-028
 (1)  
Apply a thin layer of fuel on the new O-rings.

 (2)
Install the new O-ring, between the valve and the tubing flange.

 S 434-018
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A 737-300/400/500MAINTENANCE MANUAL
 S 424-029
 (3)  Install the bypass valve.
 S 214-030
 (4)  Use the offset hole in the valve and the tubing flanges to make sure
 the valve is in the correct position.
 S 644-031
 (5)  Apply a thin layer of fuel on the new O-ring.
 S 434-019
 (6)  Install the new O-ring in the coupling.
 S 434-035
 (7)  Connect the coupling to the valve.
 NOTE:____ Do not tighten the coupling.

 S 434-020
 (8)  
Put the bonding jumper in the correct position.

 S 434-032

 (9)  
Install the bolts, washers, and nuts to attach the valve and the bonding jumper to the flange.

 S 434-021

 (10)
 Tighten the coupling.

 S 434-033

 (11)
 Install the lockwire in the coupling.

 S 434-022

 (12)
 Install the bonding jumper with the bolt, nut, and washers.

 S 764-023

 (13)
 Make sure the electrical resistance across the bonding jumper is not more than 0.010 ohm (SWPM 20-20-00).

 S 414-024

 (14)
 Install the access panel for the fuel tank (AMM 28-11-11/401).

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A
737-300/400/500MAINTENANCE MANUAL
 FUEL BOOST PUMP CHECK VALVE - REMOVAL/INSTALLATION
__________________________________________________
 1.  General
_______
 A.  This procedure has two tasks:
 (1)  
A task to remove the check valve for the fuel boost pump

 (2)  
A task to install the check valve for the fuel boost pump.

 B.  The removal procedure for all of the check valves for the fuel boost pumps is almost the same. The installation procedure for all of the check valves for the fuel boost pumps is almost the same. The access to the check valve and its location are the only differences in the procedures for each valve. The No. 1 tank contains three check valves. The No. 2 tank also contains three check valves. Because the check valves are in the tanks, it is necessary to defuel the applicable fuel tank to get access to a check valve.
 TASK 28-22-71-004-001
 2.  Fuel Boost Pump Check Valve Removal
___________________________________
 A.  References
 (1)  
AMM 28-10-00/201, Fuel Storage

 (2)  
AMM 28-11-11/401, Wing Fuel Tank Access Panels

 B.  Access
 (1)  
Location Zones
 305 Left Fuel Tank
 405 Right Fuel Tank

 (2)  
Access Panels
 7204 Fuel Tank Access Door
 7404 Fuel Tank Access Door

 C.  Procedure
 S 654-002
 WARNING: CAREFULLY DO ALL OF THE SAFETY PROCEDURES TO DEFUEL THE FUEL
_______ TANK AND TO PREPARE TO GO INTO IT. AN EXPLOSION, BAD INJURY TO PERSONS, AND DAMAGE TO EQUIPMENT CAN OCCUR.
 (1)
　
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