(8)  
You use the drain lines and a drain valve to find leakage in the APU shroud system. If you find fuel in the drained fluid, it shows that there is a leak in one of these locations:

 (a)  The APU fuel line

 (b)
The APU fuel fittingsSpecial Tools and Equipment

 (1)  
83-3124 - Main tank sump drain tool, to use on the S341T001-2 valve only or 88-5914 (for use on S341T001-3 valve or the S341T001-2 valve), Shaw Aero Devices Inc., East Hampton,

 N.Y.
 NOTE: The drain tool 83-3124 can be used only on the
____ S341T001-2 drain valve. Shaw Aero Devices Service Letter 003-11-87 Rev A dated September 16, 1988 replaces sump drain valve S341T001-2 with sump drain valve S341T001-3.
 (2)  
88-5914 - Main tank sump drain tool, to use on the S341T001-2 valve or the S341T001-3 valve, Shaw Aero Devices Inc., East Hampton, N.Y.

 (3)  
F80201-1 - sump drain tool for the center tank (airplanes with

 sump drain valve P/N 65-65382-19).Standard Tools and Equipment

 (1)  
Tube - sump drain tube for the center wing tank, 0.5 inch ID hose and clamp (on airplanes with sump drain valve P/N 8D182).

 (2)
Container - transparent plastic or glass, 1-gallon capacityReferences

 (1)  
AMM 28-22-81/401, APU Fuel Feed Line

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F.
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737-300/400/500MAINTENANCE MANUAL
Access
 (1)  Location Zones 221 Center Section Fuel Tank 305 Left Fuel Tank 405 Right Fuel Tank
Drain the APU Fuel Line Shroud Drain System (Fig. 301)
 S 493-104
 (1)  
Put the container below the drain valve.

 S 683-105

 (2)  
Open the drain valve and permit the collected fluid to drain into the container.

 S 863-106

 (3)  
Close the drain valve.

 S 213-107

 (4)  
Examine the fluid that you drained to see if there is fuel in it.

 (a)  If you find some fuel, tighten the couplings on the APU fuel line or replace APU fuel line, if it is necessary (AMM 28-22-81/401).
Drain the Sumps for the No. 1 Tank and the No. 2 Tank (Fig. 302)
 S 863-108
 (1)  Put the top end of the tool against the bottom side of the poppet on the sump drain valve.
 (a)  Push the poppet up until fuel flows into the container.
 S 683-109
 (2)  
Drain each sump until the fuel that flows into the container has no water.

 S 863-110

 (3)  
Remove the tool from the sump and permit the valve to close.

 S 213-111

 (4)  
Do a visual inspection of the fuel in the container.

 (a)  Make sure the fuel is free from contamination.
 NOTE: The fuel sample should be clear and bright.
____
 (b)  If you see water in the fuel, continue to sump the tank until the remove all of the water.
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A

DRAIN VALVE
737-300/400/500MAINTENANCE MANUAL
DRAIN LINE FOR
THE APU SHROUD

SEE A
DRAIN MANIFOLD
DRAIN MAST
DRAIN LINE FOR THE APU SHROUD A
Shroud Drain Valve Figure 301
M50327
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737-300/400/500MAINTENANCE MANUAL
 (c)  
If you see red dye in the fuel, do this task: Fuel Tanks Contaminated with Red Dye (AMM 28-11-00/701).

 (d)  
　
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