Fuel System SGR
B737-700/800/900 Fuel System
_
_
_
_
_
_
_
_
_
_
_
_
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
The Fuel System condition in this schematic depicts both engines operating , all tanks full, crossfeed valve closed, and the center tank supplying fuel to the engines. Each fuel tank uses
two AC powered fuel pumps which are cooled and lubricated by fuel passing through the pump. Center tank pumps produce higher pressure than main tank pumps. This ensures that
center tank fuel is used before main tank fuel, even though all fuel pumps are operating. Check valves are located throughout the fuel system to ensure the proper direction of fuel flow
and to prevent transfer of fuel between tanks. Individual pressure sensors monitor the output pressure of each pump.
two AC powered fuel pumps which are cooled and lubricated by fuel passing through the pump. Center tank pumps produce higher pressure than main tank pumps. This ensures that
center tank fuel is used before main tank fuel, even though all fuel pumps are operating. Check valves are located throughout the fuel system to ensure the proper direction of fuel flow
and to prevent transfer of fuel between tanks. Individual pressure sensors monitor the output pressure of each pump.
APU Fuel
Shuttoff Valve
Shuttoff Valve