(4)  
Go into the applicable tank.

 S 014-034
 S 014-006
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

Fuel Feed Check Valves
Figure 401

F96814
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 034-007
 (5)  If bonding jumpers are installed on the check valve, remove the bolt, the washer, and the nut that connect to each bonding jumper.
 (a)  Keep the bolts, nuts and washers for the installation procedure.
 S 014-023
 (6)  Remove the coupling nut from the fuel feed check valve.
 NOTE: Make sure to keep the coupling nut and retaining ring on
____
 existing tee assembly.

 S 014-024
 (7)  Remove the fuel feed check valve.
 TASK 28-22-14-404-009
 3. Fuel Feed Check Valve Installation
__________________________________
 A. References
 (1)  
AMM 12-11-00/301, Fuel Servicing

 (2)  
SWPM 20-20-00, Standard Wiring Practices Manual

 (3)  
AMM 28-10-00/201, Storage

 (4)  
AMM 28-11-11/401, Wing Fuel Tank Access Panels

 (5)  
AMM 28-22-00/201, Engine Fuel Feed System

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

 (2)  
Access Panels
 Left No. 1 Fuel Tank Access Panel
 Left No. 2 Fuel Tank Access Panel
 Right No. 1 Fuel Tank Access Panel
 Right No. 2 Fuel Tank Access Panel

 C. Procedure
 S 654-029
 WARNING: CAREFULLY DO ALL OF THE SAFETY PROCEDURES TO GO INTO THE FUEL
_______ TANK. AN EXPLOSION AND INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR IF YOU ARE NOT CAREFUL.
 (1)  
Go into the applicable fuel tank (AMM 28-10-00/201).

 S 434-011

 (2)  
Prepare to install the fuel feed check valve.

 (a) Loosely attach the clamps to the support brackets.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 424-012
 (3)  Install the fuel feed check valve to the fuel feed line.
 (a)  Put the coupling nut on the fuel feed check valve.
 CAUTION: DO NOT PUT THE RETAINING RING OUT OF ITS CORRECT SHAPE.
_______ YOU CAN CAUSE PERMANENT DAMAGE TO THE RING AND LEAKAGE AT THE FITTING.
 (b)  Tighten the coupling nut with your hand until it is tightly engaged.
 S 434-030
 CAUTION:_______MAKE SURE YOU USE TWO WRENCHES TO TIGHTEN THE FITTINGS. YOU CAN CAUSE DAMAGE TO THE FITTING OR LOOSEN THE ADJACENT FITTINGS.
 (4)  
Tighten the bolts, the washers, and the nuts that attach the fuel line clamps to the support bracket.

 S 114-017

 (5)  
Clean the mounting surfaces for the bonding jumpers with the solvent.

 S 434-018

 (6)  
Install the bolt, the washer, and the nut to connect each bonding jumper.

 S 764-019

 (7)  
Do a check of the bonding resistance between the fuel line and the airplane structure (SWPM 20-20-00).

 (a)  The bonding resistance must not be more than 0.01 ohm.
 S 794-027
 (8)  
Do a coupling vacuum test for leaks (AMM 28-22-00/201).

 S 794-028

 (9)  
Do the Engine Fuel-Feed Pressure test to check for leakage (AMM 28-22-00/201).
　
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