Fuel System SGR
B737-700/800/900 Fuel System
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The Fuel System condition in this schematic depicts both engines operating , center tank empty, crossfeed valve closed, and the respective main tank supplying fuel to each engine. The
center tank pumps are OFF and the respective LOW PRESSURE lights are extinguished. The center tank LOW PRESSURE lights will illuminate if fuel pump output pressure is low and
the FUEL PUMP switch is ON. A main tank LOW PRESSURE light will illuminate if the respective fuel pump output pressure is low and the FUEL PUMP switch is ON or if the respective
fuel pump switch is OFF.
center tank pumps are OFF and the respective LOW PRESSURE lights are extinguished. The center tank LOW PRESSURE lights will illuminate if fuel pump output pressure is low and
the FUEL PUMP switch is ON. A main tank LOW PRESSURE light will illuminate if the respective fuel pump output pressure is low and the FUEL PUMP switch is ON or if the respective
fuel pump switch is OFF.
Engine Valve
Spar Valve
Engine Valve
Spar Valve
Engine Fuel Pumps
Engine Fuel Pumps
| Check Valves |
Crossfeed Valve
Fuel Temperature
Sensor
Sensor
Engine
Suction Feed
and Bypass
Valve
Suction Feed
and Bypass
Valve
Engine
Suction Feed
and Bypass
Valve
Suction Feed
and Bypass
Valve
| Center Tank Pumps |
APU Fuel Pump
Engine 1
Forward
Pump
Forward
Pump
Engine 2
Forward
Pump
Forward
Pump
Engine 1
Aft
Pump
Aft
Pump
Engine 2
Aft
Pump
Aft
Pump
Fuel Pressure Sensors
Center Tank
Fuel Scavenge
System
Fuel Scavenge
System
HMU
HMU
Fuel Flow
Transmitter
Transmitter
Fuel Flow
Transmitter
Transmitter
APU Fuel
Shuttoff Valve
Shuttoff Valve
