(l)  
Remove the plugs from the fuel vent at each wing tip.

 (m)  
Disconnect the water manometer assembly from the adapter on the tank cover assembly.

 (n)  
Use one of the procedures given to find the internal leak source (the "Air pressure and Bubble Solution Procedure" is recommended).

 S 286-037
 (3)  
Air Bubble with Hollow Bolt Method

 (a)  
Remove a fastener and install the hollow bolt.

 (b)  
Connect the integral fuel tank leak tracer, F71329, to the hollow bolt.

 CAUTION: MAKE SURE THE FUEL TANK VENTS ARE OPEN AND NOT BLOCKED.
_______ IF THE FUEL TANK IS CLOSED (ACCESS DOORS INSTALLED AND VENTS BLOCKED), THE FUEL TANK PRESSURE CAN INCREASE AND CAUSE DAMAGE TO EQUIPMENT.
 (c)  Supply air pressure with an air source, to the tracer, F71329 and look for air bubbles in the fuel tank.
 NOTE: Use a lower pressure (1-5) psi to look for leaks.
____
 (d)  
Apply the noncorrosive soap solution to the area in the fuel tank that you think contains the leak.

 (e)  
Make a mark at the locations where you see air bubbles in the fuel tank.

 (f)  
Remove the hollow bolt.

 (g)  
Install the fastener.

 (h)  
Clean the bubble solution from in the fuel tank.

 S 286-038
 (4)  Dye Injection with Hollow Bolt Method
 NOTE: Use this method only after you use the Air Bubble with
____
 Hollow Bolt Method.

 This method is to be used only after the tank is defueled and purged. If the leak area is cleaned after the detection procedure, any remaining dye will not affect the fuel tank or the engine.
 (a)  
Remove a fastener and install the hollow bolt.

 (b)  
Connect the integral fuel tank leak tracing device to the hollow bolt.

 (c)  
Add dye through the hollow bolt.

 (d)  
Remove the integral fuel tank leak tracing device.

 (e)  
Remove the hollow bolt.

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757 MAINTENANCE MANUAL
 (f)  
Install the fastener.

 (g)  
Make a mark at the location where you first see the dye.

 (h)  
Use a cloth and remove all the dye.

 S 286-039
 (5)  Dye Injection Method
 NOTE: This method injects dye through the external leak
　
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