S 864-070
 (6)  
FOR THE APPLICABLE ENGINE; Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
On the main power distribution panel, P6: 1) 6G01 FUEL SHUTOFF VALVE ENG 1 2) 6L10 FUEL CONT VALVE ENG 1 3) 6G02 FUEL SHUTOFF VALVE ENG 2

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747-400 MAINTENANCE MANUAL
 4) 6L11 FUEL CONT VALVE ENG 2
 5) 6G03 FUEL SHUTOFF VALVE ENG 3
 6) 6L12 FUEL CONT VALVE ENG 3
 7) 6G04 FUEL SHUTOFF VALVE ENG 4
 8) 6L13 FUEL CONT VALVE ENG 4

 S 014-071
 (7)  Open the left and right core cowl panels (AMM 71-11-06/201), and the thrust reverser halves (AMM 78-31-00/201), for the applicable engine strut.
 S 864-072
 WARNING: DO NOT KEEP ELECTRICAL POWER ON DURING REMOVAL OR INSTALLATION
_______ OF THE FUEL LINES. INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR IF POWER IS APPLIED TO THE ELECTRICAL, HYDRAULIC OR FUEL SYSTEMS.
 (8)  
Remove the electrical power from the airplane (AMM 24-22-00/201).

 S 684-073

 (9)  
Drain the fuel from the fuel line and the engine fuel pump. (Fig. 404).

 (a)  
Remove the drain plug from the fuel pump (View D).

 (b)  
Drain the fuel into the container.

 (c)  
Remove and discard the O-ring from the drain plug.

 S 434-074
 (10)
 Install the drain plug after you have drained the fuel.

 (a)  
Use a new O-ring lubricated with the petrolatum.

 (b)  
Tighten the drain plug to 45-55 pound-inches
 (5.1-6.2 Newton-meters).

 (c)  
Install the lockwire on the drain plug.

 S 014-075
 (11)
 Open the applicable wing leading edge cover (Fig. 404, View B and C) (AMM 54-51-01/401).

 S 014-076

 (12)
 Open the applicable strut access panels (Fig. 404, View B and C) (AMM 54-62-00/201).

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747-400 MAINTENANCE MANUAL
 G.  Remove the Coupling O-rings From the Fuel Line in the Engine Strut (Fig. 405)
 S 034-077
 (1)
Do these steps to remove the coupling O-rings and retaining rings:

 (a)
Loosen the fuel tube clamp blocks and the saddle clamp, as necessary, to let the coupling components be removed.

 (b)  
Remove the lockwire from the coupling nuts.

 (c)  
Loosen the coupling nuts.

 (d)  
Push the coupling nut(s) away from the the fuel tube ends.

 (e)  
Remove and discard the coupling O-rings and the retaining rings.

 (f)  
Keep the other components of the coupling for the installation.

 S 034-078
 (2)  
AT LOCATIONS WITH SHROUDED COUPLINGS; Do these steps to remove the O-rings and retaining rings from the shrouded coupling.

 (a)  
Disconnect the drain line from the union.
 1) Remove the union and the O-ring.

 NOTE: Keep the union and discard the O-ring.
____
 (b)  
Loosen the coupling nut.

 (c)  
Push the shrouded coupling body away from the fuel tube end.

 (d)  
Remove and discard the coupling O-rings and the retaining rings.

 (e)  
Keep the other coupling components for the installation.

 (3)  
Install dust covers on all open fuel lines.

 S 494-079
 S 214-080
 CAUTION:_______DO NOT REPAIR THE FUEL TUBES IN THE STRUT AREA. IF A FUEL TUBE HAS DAMAGE THAT IS NOT PERMITTED PER THE ENGINE FUEL LINE DENT CRITERIA (AMM 28-22-07/601) YOU MUST REPLACE THE FUEL TUBE. A DAMAGED FUEL TUBE CAN LEAK WHICH CAN CAUSE A FIRE IN THE STRUT AREA.
 (4)  Inspect the fuel tubes and the couplings for damage
　
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