Aux Tank Fuel Pump LOW PRESSURE Light
Inoperative.

Aux Tank FUEL PUMP Switch
Inoperative.
Fuel -Controls and Indicators
737 Operations Manual
Fuel Quantity Indications
1  CTR 
1  TEST QTY  FUEL 
2  KGS ERR 7 
2  1  %  2 
FUEL  FUEL 
KGS ERR  7 %  KGS ERR  7 %  3 
1  CTR 1  ERR KG. FUEL %  2 AUX  INOPERATIVE %  3  % ERR KG. FUEL  3 
ERR FUEL  ERR FUEL 
KG.  KG. 
%  % 

1  As installed 
2  Simmonds Sunburst Fuel Quantity Indicator 
3  Smiths Sunburst Fuel Quantity Indicator 
CENTER INSTRUMENT PANEL 

Copyright . The Boeing Company. See title page for details.
12.10.4  December 1, 2000

Fuel -Controls and Indicators 737 Operations Manual

Fuel Quantity Indicator
.
indicates usable fuel in the related tank

.
standby AC power is required.

Fuel Quantity Test (QTY TEST) Switch
Indicator test is described in Supplementary Procedures.

Error (ERR) Indicator
.
ERR appears with associated error codes whenever a malfunction occurs

.
used for maintenance purposes only.

Fuel -Controls and Indicators
737 Operations Manual
Fueling / Defueling / Measurement
2
1
(multiple wing locations)
4 5 3
6
7
RIGHT WING LEADING EDGE
Copyright . The Boeing Company. See title page for details.
12.10.6  June 8, 2001

Fuel -Controls and Indicators 737 Operations Manual

Fuel Measuring Stick
Allows comparison of fuel quantity or weight as determined from measuring stick reading and fuel weight indicated by fuel quantity indicators.
.
five fuel measuring sticks are installed in each main tank

.  
for airplanes with dripsticks installed, reading is obtained by withdrawing
measuring stick from tank until a steady drip of fuel commences at the
drip hole near the base.

.  
for airplanes with floatsticks installed, reading is obtained by withdrawing
the flexible floatstick scale from the tank until the scale “sticks” or
“hangs.”

.  
floatstick indication is read from the floatstick scale level with the lower
wing skin and corrected for airplane attitude via conversion/correction
tables

Manual Defueling Valve
Open – interconnects engine feed system and fueling station for:
.
defueling

.
ground transfer of fuel.

Closed – isolates engine feed system from fueling station.

TEST GAUGES & FUELING Panel
Fueling Receptacle
Hose connection receptacle for single point underwing fueling.

Solenoid Override
Mechanically opens solenoid operated valve. Fuel valve opens if fuel pressure is available.

Fueling Valves
With battery switch ON, fuel pressure opens valve, if energized.

Fueling Power Control Switch
Door closed – proximity sensor deactivates power to fueling system.
Door open – the fueling system is powered and panel lights illuminate.
Fuel -Controls and Indicators
737 Operations Manual
Test Gauges & Fueling Panel
VALVE  POSITION  LIGHTS 
TEST 
GAGES &  2 
FUELING 
TEST  TANK No.2  CENTER TANK  TANK No.1 
1  OFF  GAGES  OPEN  OPEN  OPEN  3 
AUX FUELING  CLOSED  CLOSED  CLOSED 
POWER CONTROL 
1  1  1 
FUEL  FUEL  FUEL  4 
KGS  KGS  KGS 
ERR  7  ERR  7  ERR 7 
%  %  % 
2  AUX  RELAY  A  TEST 
TANK  U  GAGE 
5  OPEN  X 
L C  VALVE  INOPERATIVE  T 
O  POSITION  A 
E S  LIGHT  N 
D  K 
1 
FUEL 
ERR 
KG. 

#
As installed
RIGHT WING LEADING EDGE
TEST GAUGES & FUELING Switch
(spring–loaded to OFF position)
TEST GAUGES – checks operation of fuel quantity indicators.

Copyright . The Boeing Company. See title page for details.
12.10.8  December 1, 2000

Fuel -Controls and Indicators 737 Operations Manual
AUX FUELING POWER CONTROL – energizes the fueling system if the fueling power control switch fails to activate the system when the door is open.
　
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