A
A
DRAIN
TUBE
DOOR ACCESSLOWER BODY
FASTENER
DOORSKIN
SUMP DRAIN VALVE
FOR THE CENTER TANK

C

Fuel Sump Drain Valve Figure 4 (Sheet 3)
FWD
DRAIN TUBE
ACCESS DOOR
SEE D
A-A
SUMP DRAIN
PULL TO DRAIN.
RELEASE TO CLOSE.
VERIFY THAT HANDLE
RETURNS TO CLOSED
POSITION.

D
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 28-11-00
 DRAIN VALVE IN THE CENTER TANK  ú ú 02 Page 8 ú Nov 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 B.  The sump drain valves for the No. 1 and No. 2 tank are spring-loaded closed, poppet-type valves flush-mounted in the wing lower skin. A screen over each valve inlet protects the unit from contaminants which can block the drain passages. The valve primary seal can be replaced without draining or entering the fuel tank by placing the valve in the seal service position. Removal of valve assembly requires draining and entering of tank. To drain the fuel sump, the poppet is pushed up to open the valve and let fuel drain through the drain hole in the center of the valve.
 C.  The sump drain valve for the center tank is a spring-loaded closed, flapper-type check valve installed in the wing lower skin in the center section. A sump drain assembly connects the valve upper housing with the lower body section of the airplane through the keel beam area. Access to the valve is through an access door stenciled SUMP DRAIN on the lower body section. The sump is drained as follows:
 (1)  
If the sump drain valve does not have an actuating rod, insert a broad-bladed screwdriver in slot, turn clockwise and push up on the plunger. To close, release the plunger, let the slot align fore and aft, and close the access door.

 (2)  
If the sump drain valve has an actuating rod, pull on the actuating rod. To close, release the rod and close the access door.

 D.  The sump drain valves for the surge tanks are spring-loaded closed, poppet-type valves flush-mounted in the wing lower skin. A screen over each valve inlet protects the unit from contaminants which can block the drain passages. The valve has a flapper valve which lets the poppet assembly be removed without draining the fuel tank. To drain a surge tank fuel sump, the poppet is pushed up to open the valve and let fuel drain through the drain hole in the center of the valve.
 6.  Baffle Check Valves (Fig. 5)___________________
 A.  Baffle check valves are found on the bottom of wing ribs at wing buttock line 157.0, 227.0 and 557.0. The baffle check valves prevent fuel flow in the outboard direction but permit fuel flow in the inboard direction. Thus the baffle check valves prevent the boost pump inlets from being uncovered and improve airplane stability.
 B.  Each baffle check valve is a free swinging flow actuated valve. Inboard fuel flow opens the baffle check valves and outboard flow forces the baffle check valves closed.
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 28-11-00
 ALL  ú ú 03 Page 9 ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

Baffle Check Valves
Figure 5

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 28-11-00
 ALL  ú ú 01 Page 10 ú Nov 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 INTEGRAL FUEL TANKS - TROUBLE SHOOTING
______________________________________
 1.  Integral Fuel Tank Troubleshooting__________________________________
 A. General
 (1) The data in this pageblock was moved to AMM 28-11-00/601.
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