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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-22-00-002
General
The center tank boost pumps supply fuel from the center tank to
the engine fuel feed manifold.
The center tank boost pump supplies fuel at a minimum
pressure of 23 psi and a minimum flow rate of 20,000 pph (9,071
kgph).
Each pump assembly has a motor and a housing.
Location
The center tank boost pumps are on the rear spar in the wheel
well.
The pressure switch for the right and left center tank pump is on
the rear spar. Access to the left center tank boost pump
pressure switch is through the left wheel well. Access to the
right center tank boost pump pressure switch is through the
right wheel well.
Center Tank Boost Pump Housing
The housing contains these components:
* Discharge check valve
* Removal check valve
* Vapor discharge check valve.
The discharge check valve is a flapper type valve. The
discharge check valve prevents fuel flow from the engine feed
manifold through the pump.
The removal check valve is a poppet type valve. The removal
check valve closes when you remove the motor. This allows
motor removal without defueling the center tank.
The vapor discharge check valve prevents a reverse flow of
fuel, from the tank, through the pump.
Center Tank Boost Pump Motor
The motor has the impeller and uses 3-phase, 115v ac power. It
is inside the housing.
Pressure Switch
The low pressure switch sends a low center tank boost pump
pressure signal to the LOW PRESSURE light (P5).
ENGINE FUEL FEED - CENTER TANK BOOST PUMP
EFFECTIVITY
GUN ALL 28-22-00
Page 10
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-22-00-003
ENGINE FUEL FEED - CENTER TANK BOOST PUMP
ENGINE FUEL FEED - CENTER TANK BOOST PUMP
EFFECTIVITY
GUN ALL 28-22-00
Page 11
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-22-00-003
General
This page shows control of the left center tank boost pump.
Control of the right center tank boost pump is almost the same.
Left Center Tank Boost Pump Control
The center tank left boost pump switch controls the the center
tank left boost pump relay. The center tank left boost pump relay
controls electrical power to the left center tank boost pump.
With the switch in the on position, 115v ac power goes to the
relay. With the relay energized, power goes from the 115v ac
transfer bus to the left center tank boost pump.
With the switch in the off position, the relay no longer receives
115v ac power. With the relay not energized, the center tank
boost pump no longer receives power.
GUN 013-099, 103-115; GUN 001-012, 101, 102, 201-999 POST SB
737-28A1206
Left Center Tank Boost Pump Auto Shutoff
The left center tank boost pump has an auto shutoff function.
The auto shutoff function will de-energize the center tank left
boost pump relay after a time delay of 15 seconds when low
boost pump pressure is detected. With the relay not energized,
the center tank boost pump no longer receives power.
Fuel Test Panel, P61–8
The auto shutoff function can be tested with the left auto shutoff
test switch, S1, on the fuel test panel, P61–8.
The fuel test panel, P61–8, is found in the rear of the flight
compartment on the right side. The fuel test panel, P61–8, is not
used by the flight crew.
GUN ALL
Pressure Indication
A LOW PRESSURE light comes on when the center tank left
boost pump switch is in the on position and the left center tank
boost pump pressure is 22 psig or less.
ENGINE FUEL FEED - FUNCTIONAL DESCRIPTION - CENTER TANK BOOST PUMP
EFFECTIVITY
GUN ALL 28-22-00
Page 12
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-22-00-004
ENGINE FUEL FEED - FUNCTIONAL DESCRIPTION - CENTER TANK BOOST PUMP
ENGINE FUEL FEED - FUNCTIONAL DESCRIPTION - CENTER TANK BOOST PUMP
EFFECTIVITY
GUN 001-012, 101, 102, 201-999 PRE SB 737-28A1206 28-22-00
Page 13
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-22-00-004
ENGINE FUEL FEED - FUNCTIONAL DESCRIPTION - CENTER TANK BOOST PUMP
ENGINE FUEL FEED - FUNCTIONAL DESCRIPTION - CENTER TANK BOOST PUMP
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