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 S 865-077
 (3)  Disconnect the external electrical power if it is not necessary for other tasks (AMM 24-22-00/201).
 TASK 28-22-00-785-214
 5.  Fuel Boost Pump Output Pressure Test____________________________________
 A.  General
 (1)  This procedure does a check of the output pressure of each of the boost pumps in the No. 1 tank and the No. 2 tank. If a pump does not supply a minimum output pressure, that pump could have a problem.
 (a) The output pressure can be measured two different ways:
 1)  Method 1 measures the output pressure of each of the boost pumps at the drain for the fuel filter housing on one of the engines.
 2)  Method 2 measures the output pressure of each of the boost pumps at the forward spar fitting for the fuel feed low pressure switch. This procedure is recommended if the low pressure switches are being replaced. Also, if one switch is to be replaced, all four switches are recommended to be replaced.
 (2)  
This test measures the output pressure of all four fuel boost pumps for the two main tanks. This test is not necessary for the two fuel boost pumps for the center fuel tank.

 (3)  
This procedure incorporates the output pressure test for the fuel boost pumps from Boeing Service Bulletin 737 28A1114R3.

 B.  Equipment
 (1)  
Gage - to measure fuel pressure, Range: 0-50 psig, Accurate to +/- 1 psig (Fig. 502B)

 (2)  
Hose - with bleed valve and fitting with 0.5625-18 UNF Thread (Fig. 502B)

 (3)  
Container - able to contain fuel, 5 gallons minimum

 C.  Consumable Materials
 (1)  Safety wire (CP 8001 or CP 8002) (AMM 70-10-01/201)
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A 737-300/400/500MAINTENANCE MANUAL
 (2)  Petrolatum - Pure Mineral Lubricant (CP2102),
 local purchase (AMM 70-10-01/201)

 D. References
 (1)  
AMM 24-22-00/201, Electrical Power

 (2)  
AMM 28-22-41/401, Fuel Boost Pump

 (3)  
AMM 28-42-00/501, Fuel Feed Low Pressure Indicating System

 (4)  
AMM 28-42-11/401, Fuel Feed Low Pressure Switch

 (5)  
AMM 71-00-00/501, Power Plant

 (6)  
AMM 71-11-02/201, Fan Cowl Panels

 (7)  
AMM 73-11-02/401, Fuel Filter Cartridge

 E. Access
 (1)  
Location Zones
 101 Control Cabin - Left
 102 Control Cabin - Right
 303 Left Wing Inboard Leading Edge
 305 Left Fuel Tank
 403 Right Wing Inboard Leading Edge
 405 Right Fuel Tank
 502/503 Fan Cowl Panels - Engine No. 1
 602/603 Fan Cowl Panels - Engine No. 2
 506 Engine No. 1
 606 Engine No. 2

 (2)  
Access Panels
 5746L Engine No. 1 - Left Fan Cowl Panel
 5846R Engine No. 2 - Left Fan Cowl Panel

 

 F. Test Preparation
 S 865-215
 (1) Prepare the pressure gage and hose for the test (Fig. 502B).
 NOTE: The hose with the pressure gage, fitting and valve is local
____ manufacture. The pressure gage must be 0-50 psi in 1 psi divisions with an accuracy of 2 percent.
 To install the pressure gage and hose in the drain on the fuel filter housing, use a 0.5625-18 UNJF or 0.5625-18 UNF fitting on the hose.
 To install the pressure gage and hose in the forward spar fitting for the fuel feed low pressure switch, use a 0.4375-20 UNJF fitting on the hose.
 S 865-253
 (2)  Supply external electrical power (AMM 24-22-00/201).
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737-300/400/500MAINTENANCE MANUAL
 S 865-216
 (3)  
Make sure there is a minimum of 2,000 pounds (900 kilograms) of fuel in the No. 1 tank and 2,000 pounds (900 kilograms) of fuel in the No. 2 tank.
　
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