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A LOW PRESSURE light comes on when the center tank boost
pump pressure is low and the center tank boost pump switch is
in the ON position.
GUN 013-099, 103-115; GUN 001-012, 101, 102, 201-999 POST SB
737-28A1206
There is a 10 second delay after the fuel LOW PRESSURE light
comes on, before the master caution light comes on.
GUN ALL
Fuel Boost Pump
A switch on the fuel system panel (P5-2) controls each forward
and aft boost pump for main tank No. 1 and main tank No. 2. The
switches control power to the pumps.
Fuel Boost Pump Indication
A LOW PRESSURE light comes on when the fuel boost pump
pressure is low or when the boost pump switch is in the OFF
position.
Bypass Valve
A bypass valve supplies a secondary fuel flow path to the
engines. The bypass valves operate automatically.
Engine Fuel Spar Valve
The engine fuel spar valves control fuel flow to the engines. The
engine start levers and the engine fire switches control the
engine fuel spar valves.
ENGINE FUEL FEED - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL 28-22-00
Page 5
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-22-00-001
Fuel Spar Valve Battery
The engine fuel spar valve battery makes sure that the engine
fuel feed system always has power to close the engine fuel spar
valve.
Engine Fuel SPAR Valve Indication
A blue SPAR VALVE CLOSED light shows valve position.
Crossfeed Valve
The crossfeed valve permits a single fuel tank to supply fuel to
both engines. A switch on the fuel system panel (P5-2) controls
the crossfeed valve.
Crossfeed Valve Indication
A blue VALVE OPEN light shows valve position.
Water Scavenge Ejector Pumps
The water scavenge jet pumps remove water from the low
points of each tank to prevent corrosion. The center tank, main
tank No. 1, and main tank No. 2 boost pumps control the
operation of the water scavenge ejector pumps.
ENGINE FUEL FEED - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL 28-22-00
Page 6
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-22-00-001
ENGINE FUEL FEED - GENERAL DESCRIPTION
ENGINE FUEL FEED - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL 28-22-00
Page 7
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-22-00-001
General
The engine fuel feed system has these components:
* Center tank boost pump (2)
* Forward and aft boost pump (4)
* Crossfeed valve
* Engine fuel spar valve (2)
* Bypass valve (2)
* Water scavenge ejector pump (4).
Center Tank Boost Pumps
There are two center tank boost pumps in the center tank. They
are on the rear spar. Access to the center tank boost pumps is
through the wheel wells.
Forward And Aft Boost Pumps
There are forward and aft boost pumps in main tank No. 1 and
No. 2. The forward boost pumps are on the front spar. The aft
boost pumps are on the rear spar. Access to the forward boost
pumps is through extended krueger flaps. Access to the aft
boost pumps is through the wheel wells.
Crossfeed Valve
The crossfeed valve is on the right side of the center tank on the
rear spar. Access to the crossfeed valve is through the right
wheel well.
Engine Fuel Spar Valves
There is one engine fuel spar valve for each engine. The engine
fuel spar valves are on the front spar outboard of each strut.
Bypass Valves
There is one bypass valve in main tank No. 1 and No. 2. The
bypass valve connects to the fuel feed manifold.
Water Scavenge Ejector Pumps
There is one water scavenge ejector pump in main tank No. 1
and No. 2. There are two water scavenge ejector pumps in the
center tank. All of the water scavenge ejector pumps are on the
rear spar.
Fuel Shutoff Valve Battery
The fuel shutoff valve battery is in the P6 panel.
ENGINE FUEL FEED - COMPONENT LOCATION
EFFECTIVITY
GUN ALL 28-22-00
Page 8
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-22-00-002
ENGINE FUEL FEED - COMPONENT LOCATION
ENGINE FUEL FEED - COMPONENT LOCATION
EFFECTIVITY
GUN ALL 28-22-00
Page 9
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
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