(c)  
Look for bubbles that show the location of the leak.

 (d)  
It is also possible to feel for blowing air to find the leak.

 (e)  
Find all leak locations on the internal surface of the fuel tank.

 NOTE: It is possible that three or four internal leaks are
____ related to one external leak location. Make a signal to the person out of the tank to stop the backblowing procedure when you find all of the leaks.
 (f) Make a mark on these leak locations with the marking pen.
 NOTE: If you are not sure you found the correct leak path,
____ you can apply the bubble solution to the external leak location and blow air through the internal leaks. If air blows through the external leak location, you found the correct leak path.
 S 366-013
 (9)  If you find a leak in a self-sealing fastener, refer to AMM 28-11-00/801 for procedures to do a temporary repair of self-sealing fasteners with leaks.
 NOTE: Self-sealing fasteners are frequently used in the fuel
____ tank. These fasteners have a plastic collar that prevents fuel flow. They are not covered with sealant. Do not put sealant on these fasteners unless you find one with a leak. The only permanent repair of a self-sealing fastener with a leak is to remove the used fastener and install a new one (Ref Structural Repair Manual).
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MAINTENANCE MANUAL

Backblowing Procedure (Example)
Figure 603

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MAINTENANCE MANUAL

8.0 INCHES
THIS DIMENSION CAN CHANGE
ST982-J

0.38 INCH

TOOLS TO CUT THE SEALANT

0.88 INCH 
ST980A-S-B  ST980A-S-T 
ST980A-S  ST982L 

TOOLS TO REMOVE UNWANTED SEALANT
(SCRAPERS)

Sealant Removal Tools
Figure 604

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