737 Flight Crew Operations Manual
Fuel -
Controls and Indicators
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12.10.2 D6-27370-866-EGP
3 Crossfeed VALVE OPEN Light
Extinguished – crossfeed valve is closed.
Illuminated (blue) –
• bright – crossfeed valve is in transit, or valve position and
CROSSFEED selector disagree.
• dim – crossfeed valve is open.
4 FILTER BYPASS Lights
Extinguished – fuel filter operating normally.
Illuminated (amber) – impending fuel filter bypass due to a contaminated filter.
5 CROSSFEED Selector
Controls fuel crossfeed valve.
Closed – isolates engine No. 1 and No. 2 fuel feed lines.
Open – connects engine No. 1 and No. 2 fuel feed lines.
6 Center Tank FUEL PUMP LOW PRESSURE Lights
Illuminated (amber) – fuel pump output pressure is low and FUEL PUMP switch
is ON.
Note: With the Center (CTR) tank FUEL PUMP switches ON, continuous
illumination of one LOW PRESSURE light for 10 seconds illuminates
MASTER CAUTION and FUEL system annunciator lights.
Extinguished – fuel pump output pressure is normal, or FUEL PUMP switch is
OFF.
7 FUEL PUMP Switches
ON – activates fuel pump.
OFF – deactivates fuel pump.
Note: When a center tank fuel pump switch is set to OFF, the auto shutoff logic
for that pump is reset. When the center tank fuel pump switch is set to ON
after being OFF, the pump will again activate until the switch is set to OFF
or auto shutoff logic deactivates it.
September 26, 2013
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