S 014-003

 (2)  
Get access to the check valve that you must remove.

 (a)  Remove the access panel, No. 1, (7204 or 7404) for the applicable fuel tank (AMM 28-11-11/401).
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A
737-300/400/500MAINTENANCE MANUAL
 (b)  Remove the applicable rib access openings (Fig. 401).
 S 034-006
 (3)  Disconnect the low pressure line.
 S 034-007
 CAUTION:_______DO NOT LET THE CHECK VALVE FALL. DAMAGE TO THE WING SKIN CAN EASILY OCCUR.
 (4)  
Remove the bolts and the nuts that attach the fuel line.

 S 034-009

 (5)
Remove the bolts and the nuts that attach the check valve.

 S 024-010

 (6)  
Remove the check valve.

 (a)  
Remove the O-rings from the flanges of the check valve.

 (b)  
Discard the O-rings.

 TASK 28-22-71-404-011
 3.  Fuel Boost Pump Check Valve Installation (Fig. 401)________________________________________
 A. Consumable Materials
 (1)  B00316 - Aliphatic Naphtha
 B. References
 (1)  
AMM 12-11-00/301, Fuel Servicing

 (2)  
AMM 28-11-11/401, Wing Fuel Tank Access Panels

 C. Access
 (1)  
Location Zones
 305 Left Fuel Tank
 405 Right Fuel Tank

 (2)  
Access Panels
 7204 Fuel Tank Access Door
 7404 Fuel Tank Access Door

 D. Procedure
 S 114-012
 (1)  Clean these surfaces with the solvent and dry them with a lintfree cloth:
 (a)  
The O-ring grooves on the check valve

 (b)  
The machined surfaces of the valve

 (c)  
The mating surfaces on the housing for the boost pump.

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A 737-300/400/500MAINTENANCE MANUAL
BOOST PUMP SEE A
RIB ACCESS
OPENINGS
(SOME RIB ACCESS
OPENINGS HAVE ACCESS
DOORS INSTALLED)

ACCESS PANEL NO. 1
MOUNTING BOLTS FOR THE BOOST PUMP FUEL LINE (4 LOCATIONS) HOUSING 1
O-RING
MOUNTING NUTS FOR THE FUEL LINE (4 LOCATIONS)
CHECK VALVE
LOW PRESSURE LINE
MOUNTING BOLTS FOR THE CHECK VALVE (4 LOCATIONS)
REMOVAL VALVE
O-RING
1
BOOST PUMP HOUSING SHOWN IS FOR
BOOST PUMP
TANK NO. 1 AND 2 AFT BOOST PUMPS AND
CENTER TANK RIGHT AND LEFT BOOST PUMPS.

A
NO. 1 AND 2 FORWARD BOOST PUMPS ARE MOUNTED
ON WING FRONT SPAR.

Fuel Boost Pump Check Valve Installation
Figure 401

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 (2)  S 434-013Install new O-rings, lightly lubricated with fuel, in the check valve flanges.
 (3)  S 424-014Put the check valve in its correct position on the housing for the boost pump.
 (4)  S 434-015Install the nuts and the bolts that attach the check valve.
 (5)  S 434-016Install the nuts and the bolts to attach the fuel line to the check valve.
 (6)  S 434-017Connect the low pressure line.
 (7)  S 414-018Install the access doors in the rib openings, if you removed them (AMM 20-50-11/201).
 (8)  S 414-019Install the access panel for the wing tank that you removed to get access to the check valve (AMM 28-11-11/401).
　
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