(1)  
Location Zones
 133 Wing Center Section (Left)
 134 Wing Center Section (Right)
 531 Center Wing Tank (Left)
 541 Main Tank - Rib No. 5 to No. 17 (Left)
 542 Main Tank - Rib No. 17 to No. 21 (Left)
 543 Surge Tank - Rib No. 21 to No. 23 (Left)
 631 Center Wing Tank (Right)
 641 Main Tank - Rib No. 5 to No. 17 (Right)
 642 Main Tank - Rib No. 17 to No. 21 (Right)
 643 Surge Tank - Rib No. 21 to No. 23 (Right)

 D.
Repair of Nonsealant Leaks

 S 968-022
 (1)  
If the molded rubber seal on a tank access door leaks, replace the tank access door.

 S 968-023

 (2)  
If an O-ring on a fuel system component leaks, do the steps that follow to replace the O-ring:

 (a)  
Get the correct replacement O-ring.

 (b)  
Make sure the cure date of the replacement O-ring is less than 48 months ago.

 (c)  
Remove the used O-ring from the component.

 WARNING: DO NOT GET SOLVENTS IN YOUR MOUTH, OR YOUR EYES, OR ON
_______ YOUR SKIN. DO NOT BREATHE THE FUMES FROM SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. REFER TO PRODUCT MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES.
 (d)  Clean the O-ring groove and the flat surfaces that the O-ring is between with solvent, Series 93 (AMM 20-30-93/201).
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A

757
MAINTENANCE MANUAL

 (e)  
Rub the surfaces dry with clean gauze.

 (f)  
Examine the O-ring groove and the adjacent fuel surface for cuts, scratches, dents, distortions, and unwanted material.

 (g)  
Repair or replace all defective components.

 (h)  
Examine the new O-ring for defects.

 (i)  
Discard the O-ring if it is defective.

 (j)  
Make a mark on the component that you install the O-ring on of the cure date.

 (k)  
Make sure the O-ring fits in the groove.

 (l)  
Install the O-ring (AMM 20-10-19/401).

 (m)  
Assemble the component.

 TASK 28-11-00-308-063
 9. Approved Repair of the Secondary Fuel Barrier Sealant
_____________________________________________________
 A. General
 (1)  
If there is leakage in the secondary fuel barrier, the leakage must be repaired before the airplane is released for flight.
　
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