(2)  
With the pump on and fuel available at the inlet port, the inlet impeller provides about 28,000 pounds of fuel per hour at 27 psi minimum. With the pump on and no fuel available at the inlet port, the primer impeller maintains reprime capabilities up to 11 minutes and resumes pumping when fuel is again available. A thermal fuse in each winding of the 3 phase, AC motor protects the motor from overheating. The fuses open at 400°F.

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757 MAINTENANCE MANUAL
SEE A
SEE A 
DISCHARGE CHECK 
VALVE  TO ENGINE 
PUMP INLET 
LINE 
REMOVAL 
CHECK VALVE 
PRIMER DISCHARGE PORT 
INLET PORT  AND CHECK VALVE 
ELECTRICAL 
CONNECTOR 
BOOST PUMP 
HOUSING 
SPAR 
MOTOR/IMPELLER UNIT 
A 
Main Tank Fuel Boost Pump 
Figure 4 

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757
MAINTENANCE MANUAL

SEEA
DISCHARGE CHECK
TO ENGINE
VALVE
WET SIDE
PRIMER DISCHARGE PORT
AND CHECK VALVE
FROM BOOST
PUMP INLET
BONDING
JUMPER
REMOVAL
CHECK
MOTOR/IMPELLER VALVE UNIT
ELECTRICAL INLET PORT
CONNECTOR
BOOST PUMP HOUSING
DRY SIDEFWD
REAR SPAR A
Center Tank Override Pump Figure 5
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MAINTENANCE MANUAL

 E. Fuel Boost Pump Discharge Check Valve
 (1)  
A fuel boost pump discharge check valve mounts to the discharge port of each main tank fuel boost pump and each center tank override pump. The check valve, a spring loaded closed flapper valve, allows normal fuel flow from the boost pump discharge to the engine and prevents reverse fuel flow through the pump.

 F.
Fuel Boost Pump Removal Check Valve
　
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本文鏈接地址：757 AMM 飛機維護手冊 燃油 CHAPTER 28 - FUEL 2(99)