Shroud Drain Line
Figure 2

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A
737-300/400/500MAINTENANCE MANUAL
 FUEL VENT SYSTEM - INSPECTION/CHECK
___________________________________
 1.  General________
 A. This procedure has one task, a pressure check of the fuel vent system.
 B. To do the pressure check, you close these openings for the vent system:
 (1)
The fuel shutoff valves

 (2)
The ram air scoops for the vent system

 (3)
The internal vent openings.

 C.  You then pressurize the system to 5.0 |0.2 psi through a hose connection. You must not pressurize the vent system to more than 5.2 psi.
 D.  The ambient temperature and the ambient pressure must be constant during the pressure check.
 E.  You must attach safety streamers to all of the equipment that you use to close the vent openings. You must remove all of this equipment when you complete the pressure check. If you do not remove all of this equipment, bad damage will occur.
 TASK 28-13-00-786-002
 2.  Fuel Vent System Pressure Check_______________________________
 A.  Equipment
 (1)  
F80080-129 - Fuel Tank and Vent System Testing Kit (or the equivalent)(two kits are necessary to do the test for the vent system for the center tank).

 (a)
F80080-100 - Two Structural Vent Plugs

 (b)
F80080-88 - Two Vent Scoop Closure Plugs

 (c)
F80080-8 - One Float Valve Closure Plug

 (d)
F80080-55 - One Surge Tank Drain Tube Plug Assembly

 (e)
F80080-82 - One Surge Tank Pressure Door Assembly

 (f)
F80080-26 - One Vent Float Valve Stop Assembly

 (g)
F80080-29 - One Crossover Vent Tube Plug Assembly

 (h)
F80080-56 - Two Structural Vent Cover Assemblies

 (i)
F80080-112 - Two drain valve plugs

 (j)
F80080-49 - Two Tube Plug Assemblies

 (2)
F72951-1 - Manometer, water safety relief

 (3)
Source - air pressure, 0 to 5 psi

 (4)  
Streamers - safety, made of heavy red cotton webbing, to identify closure equipment

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 B.
C.
D.
E.

A