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Standard overwing fueling receptacles for main tanks No. 1 and No. 2 are provided for gravity fueling. In the absence of underwing pressure fueling facilities, center tank servicing can only be accomplished through the ground tank to tank fuel transferring operation.
The manual defueling valve, located outboard of engine No. 2, interconnects the engine feed system and the fueling station. It is opened for defueling and tank to tank transfer operations.
A shutoff system is used during fueling to automatically close the fueling valve in each fuel tank when the tank is full.
Flame Arrestor and Surge Tank Protections (As Installed)
A passive flame arrestor is installed in each vent line in the ram air vent scoop. Its purpose is to prevent a flame front, originating from an external source, from entering the fuel tanks.
If the arrestor becomes clogged, a relief valve in the outboard fuel tank access plate will open to prevent tank or wing damage. When the valve is open a red reset shaft will remain exposed indicating that the flame arrestor requires inspection.
Fuel Quantity Indication
The fuel quantity indication system calculates the useable fuel quantity in each tank. The fuel quantity in each tank is displayed on the center instrument panel and on the fueling station panel.
Fuel Tank Location and Capacities (Usable Fuel)
Main tanks No. 1 and No. 2 are integral with the wing structure. The center tank lies between the wing roots within the fuselage area and extends out into the wing structure.
These figures represent approximate amounts of usable fuel. The appropriate weight and balance control and loading manual gives exact figures for all conditions.
Fuel -System Description 737 Operations Manual

TANK  GALLONS  POUNDS* 
NO. 1  1,499  10,043 
NO. 2  1,499  10,043 
CENTER  2,313  15,497 
TOTAL  5,311  35,583 

*
Usable fuel at level attitude, fuel density = 6.7 pounds per US gallon

*
Usable fuel at level attitude, fuel density = 0.8029 kilograms per liter

TANK  LITERS  KILOGRAMS* 
NO. 1  5,674  4,555 
NO. 2  5,674  4,555 
CENTER  8,755  7,029 
TOTAL  20,103  16,139 

Copyright . The Boeing Company. See title page for details.
12.20.4  December 3, 2004
Fuel -
  System Description 
737 Operations Manual 

Fuel Schematic
FUEL VALVE FUEL VALVE
CLOSED
CLOSED FUEL
0 -20 +20
TEM -40 +40
C °
FILTER VALVE FILTER
BYPASS OPEN BYPASS
FEEDCROSS
LOW LOW
PRESSURE PRESSURE
CTR FUEL PUMPS 
OFF 
L  R 
ON 
1  INOP  INOP 
AUX      PUMPS INOP 
OFF 
FWD  AFT  ENGINE 
ON  FUEL 
LOW PRESSURE LOW PRESSURE  LOW PRESSURE LOW PRESSURE  SHUTOFF 
1  OFF 1  FUEL PUMPS  OFF 2  VALVE  2 
AFT  FWD  AFT 
ON  ON 

ENGINE
FUEL
CROSSFEED SHUTOFF
VALVE MANUAL
VALVE ENGINE DEFUELING
DRIVEN VALVE
FUEL PUMP
FUEL SCAVENGE
CENTER SHUTOFF
TANK
FUELING VALVE
STATION CENTER TANK SCAVENGE JET PUMP
BYPASS
VALVE NO. 2 TANK
NO. 1TANKPROVISIONS
 APU FUEL 2 FOR
SHUTOFF TO APU AUXILIARY
VALVE  FUEL TANKS
APU FUEL
3 PUMP APU BYPASS VALVE
FUEL FEED CONDITION: ENGINES OPERATING CENTER TANK FEEDING ENGINES
# As installed
Copyright . The Boeing Company. See title page for details.
December 6, 2002  12.20.5
Fuel -System Description 737 Operations Manual

Intentionally
Blank

Copyright . The Boeing Company. See title page for details.
12.20.6  June 7, 2002

737 Operations Manual

Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.10.1
Hydraulic Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.10.1 Hydraulic Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.10.2 Flight Control Panel (before Rudder System Enhancement Program (RSEP) modification)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.10.3 Flight Control Panel (after Rudder System Enhancement Program (RSEP) modification)  . . . . . . . . . . . . . 13.10.5
System Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.20.1
Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.20.1 Hydraulic Power Distribution Schematic . . . . . . . . . . . . . . . 13.20.1
　
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