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Directorate of OperationalSlide 1 of 83

737-300/400

FUEL

NextMain Menu Quit
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737-300/400 Fuel Schematic

To APU

APU fuel

shutoff

valveAPU bypass

valve

Bypass

valve

No. 1

fuel tank

No. 1

engineNo. 2

engine

Engine driven

fuel pump

Bypass

valveCenter fuel tank

No. 2

fuel tank

Engine fuel

shutoff valve

Engine drivenfuel pump

Engine fuel

shutoff valve

Manual defueling valve

Center left

pump

Center right

pump

No. 2 fwd

pump

No. 2 aft

pump

Center right

pump inlet

Center left

pump inletNo. 1 fwd

pump

No. 1 aft

pump

Fueling receptacle

When pulled,

closes No. 1 engine

fuel shutoff valve

When pulled,

closes No. 2 engine

fuel shutoff valve

Fuel temperature

indicator

Pressure fuelingstation

Surge tankSurge tank

Crossfeed valve

Scavenge

valve

Scavenge

inlet

Center tank

scavenge jet

pump

Fuel shutoff

valves (3)
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No. 1

fuel tank Center fuel tank No. 2

fuel tank

There are three fuel tanks: No. 1, Center, and No. 2. The No. 1 and No. 2

fuel tanks are located in the interspar area of each wing. The center fuel

tank is contained in the fuselage (wing center section).

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No. 1


fuel tank

A pressure fueling station is installed on the right wing leading

edge. A fueling receptacle allows a hose to be connected for

fueling. Shutoff valves control fuel distribution to the tanks.

Fueling receptacle


No. 2

fuel tank

Center fuel tankNo. 1

fuel tank

Fuel shutoff

valves (3)

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One surge tank can be found outboard of each wing fuel tank. Vent channels allow the surge tanks to collect any fuel

overflow from the main tanks. A surge tank drain line then allows the fuel overflow to drain back into the center tank, but

prevents fuel flow from the center tank to the surge tank. Each surge tank has a capacity of approximately 30 U.S. gallons.


No. 1


fuel tank

No. 2

fuel tank


fuel tank

Fueling receptacle


Fuel shutoff

valves (3)

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A fuel vent scoop is located on each outboard lower wing surface, under the surge tank. The scoops create positive pressure

during flight and are the overboard vents for the vent system. If a significant amount of overflow fuel is collected in a surge

tank, the fuel will be discharged overboard via the vent scoops. The scoops are designed to prevent ice accumulation.

See picture of

fuel vent scoop

No. 1


fuel tank

No. 2

fuel tank


fuel tank


Fueling receptacle


Fuel shutoff

valves (3)
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The No. 1 fuel tank contains a forward and aft fuel boost pump. Each pump is AC powered and is fuel

cooled and lubricated. The forward pump is attached to the forward wing spar and the aft pump is installed

in a dry bay within the fuel tank. The wing spar and dry bay isolate the pump motor from the fuel in the tank.

No. 1


fuel tank

No. 2

fuel tank


fuel tank


Fueling receptacle


Fuel shutoff

valves (3)

No. 1 fwd

pump

No. 1 aft

pump

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Fuel from the tank enters each pump through a wire mesh screen via a suction tube inlet. Fuel is

discharged from the pump under pressure through the boost pump check valve. The check valves are

located inside the fuel tank and will open when respective fuel pump pressure is approximately 12 psi.

No. 1


fuel tank

No. 2

fuel tank


fuel tank


Fueling receptacle


Fuel shutoff

valves (3)

No. 1 fwd

pump

No. 1 aft

pump

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The No. 1 tank fuel LOW PRESSURE lights will illuminate when the respective fuel

pump switch is ON and fuel boost pump pressure is low. The LOW PRESSURE

lights will also illuminate when the respective fuel pump switch is OFF.

No. 1


fuel tank

No. 2

fuel tank


fuel tank


Fueling receptacle


No. 1 fwd

pump

No. 1 aft

pump

Fuel shutoff

valves (3)

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Engine fuel

shutoff valve

When pulled,

closes No. 1 engine

fuel shutoff valve

Prior to fuel entering the No. 1 engine, it must first pass through the engine fuel shutoff valve. The valve is

electrically (DC) opened when the No. 1 engine start lever is positioned from CUTOFF to IDLE. The valve closes when

the start lever is lowered from IDLE to CUTOFF. The valve also closes when the No. 1 engine fire switch is pulled.

No. 1


fuel tank

No. 2

fuel tank


fuel tank


Fueling receptacle


No. 1 fwd

pump

No. 1 aft

pump

Fuel shutoff

valves (3)

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From the engine fuel shutoff valve, fuel is delivered to

the No. 1 engine via the main engine control (MEC).

No. 1

engine

No. 1


fuel tank

No. 2

fuel tank


fuel tank


Fueling receptacle


No. 1 fwd

pump

No. 1 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 1 engine

fuel shutoff valve

Fuel shutoff

valves (3)

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A bypass valve allows fuel to be drawn out of the tank by an engine driven

fuel pump. This would only occur if both No. 1 fuel tank pumps were to

fail. The engine driven fuel pump is attached to the engine gearbox.

No. 1


fuel tank

No. 2

fuel tank


fuel tank


Fueling receptacle


No. 1 fwd

pump

No. 1 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 1 engine

fuel shutoff valveNo. 1

engine

Fuel shutoff

valves (3)

Bypass

valve

Engine driven

fuel pump

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A fuel temperature sensor is located in the No. 1 fuel tank.

The fuel temperature indicator displays the results in C.

No. 1


fuel tank

No. 2

fuel tank


fuel tank


Fueling receptacle


No. 1 fwd

pump

No. 1 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 1 engine


engine

Bypass

valve

Engine driven

fuel pump

Fuel shutoff

valves (3)Fuel temperature

indicator

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The No. 2 fuel tank contains a forward and aft fuel boost pump. Each pump is AC powered and is fuel

cooled and lubricated. The forward pump is attached to the forward wing spar and the aft pump is installed

in a dry bay within the fuel tank. The wing spar and dry bay isolate the pump motor from the fuel in the tank.

No. 1


fuel tank

No. 2

fuel tank


fuel tank


Fueling receptacle


No. 1 fwd

pump

No. 1 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 1 engine


engine

Bypass

valve

Engine driven

fuel pump

Fuel temperature

indicator

Fuel shutoff

valves (3)

No. 2 fwd

pump

No. 2 aft

pump

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Fuel from the tank enters each pump through a wire mesh screen via a suction tube inlet. Fuel is


located inside the fuel tank and will open when respective fuel pump pressure is approximately 12 psi.

No. 1


fuel tank

No. 2

fuel tank


fuel tank


Fueling receptacle


No. 1 fwd

pump

No. 1 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 1 engine


engine

Bypass

valve

Engine driven

fuel pump

Fuel temperature

indicator

Fuel shutoff

valves (3)

No. 2 fwd

pump

No. 2 aft

pump

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The No. 2 tank fuel LOW PRESSURE lights will illuminate when the respective fuel


lights will also illuminate when the respective fuel pump switch is OFF.

No. 1


fuel tank

No. 2

fuel tank


fuel tank


Fueling receptacle


No. 1 fwd

pump

No. 1 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 1 engine


engine

Bypass

valve

Engine driven

fuel pump

Fuel temperature

indicatorNo. 2 fwd

pump

No. 2 aft

pump

Fuel shutoff

valves (3)

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Engine fuel

shutoff valve

When pulled,

closes No. 2 engine

fuel shutoff valve

Prior to fuel entering the No. 2 engine, it must first pass through the engine fuel shutoff valve. The valve is

electrically (DC) opened when the No. 2 engine start lever is positioned from CUTOFF to IDLE. The valve closes when

the start lever is lowered from IDLE to CUTOFF. The valve also closes when the No. 2 engine fire switch is pulled.

No. 1


fuel tank

No. 2

fuel tank


fuel tank


Fueling receptacle


No. 1 fwd

pump

No. 1 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 1 engine


engine

Bypass

valve

Engine driven

fuel pump

Fuel temperature

indicatorNo. 2 fwd

pump

No. 2 aft

pump

Fuel shutoff

valves (3)

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From the engine fuel shutoff valve, fuel is delivered to

the No. 2 engine via the main engine control (MEC).

No. 2

engine

No. 1


fuel tank

No. 2

fuel tank


fuel tank


Fueling receptacle


No. 1 fwd

pump

No. 1 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 1 engine


engine

Bypass

valve

Engine driven

fuel pump

Fuel temperature

indicatorNo. 2 fwd

pump

No. 2 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 2 engine

fuel shutoff valve

Fuel shutoff

valves (3)

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A bypass valve allows fuel to be drawn out of the tank by an engine driven

fuel pump. This would only occur if both No. 2 fuel tank pumps were to

fail. The engine driven fuel pump is attached to the engine gearbox.

No. 1


fuel tank

No. 2

fuel tank


fuel tank


Fueling receptacle


No. 1 fwd

pump

No. 1 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 1 engine


engine

Bypass

valve

Engine driven

fuel pump

Fuel temperature

indicatorNo. 2 fwd

pump

No. 2 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 2 engine


engine

Fuel shutoff

valves (3)

Bypass

valve

Engine driven

fuel pump

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The DC powered crossfeed valve connects the left and right fuel manifold.

It provides a means of directing fuel to either engine from any tank.

Crossfeed valve

No. 1


fuel tank

No. 2

fuel tank


fuel tank


Fueling receptacle


No. 1 fwd

pump

No. 1 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 1 engine


engine

Bypass

valve

Engine driven

fuel pump

Fuel temperature

indicatorNo. 2 fwd

pump

No. 2 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 2 engine


engine

Bypass

valve

Engine driven

fuel pump

Fuel shutoff

valves (3)

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The center fuel tank utilizes the left and right fuel boost pump. Each pump is AC powered and is fuel cooled

and lubricated. The center left pump is installed in a dry bay within the No. 1 fuel tank. The center right pump is

installed in a dry bay within the No. 2 fuel tank. The dry bay isolates the pump motor from the fuel in the tank.

No. 1


fuel tank

No. 2

fuel tank


fuel tank


Fueling receptacle


No. 1 fwd

pump

No. 1 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 1 engine


engine

Bypass

valve

Engine driven

fuel pump

Fuel temperature

indicatorNo. 2 fwd

pump

No. 2 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 2 engine


engine

Bypass

valve

Engine driven

fuel pump

Crossfeed valve

Fuel shutoff

valves (3)

Center left

pump

Center rightpump

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Fuel from the center tank enters each pump through a wire mesh screen via a suction tube inlet. Fuel is


located inside the fuel tank and will open when respective fuel pump pressure is approximately 1.3 psi.

No. 1


fuel tank

No. 2

fuel tank


fuel tank


Fueling receptacle


No. 1 fwd

pump

No. 1 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 1 engine


engine

Bypass

valve

Engine driven

fuel pump

Fuel temperature

indicatorNo. 2 fwd

pump

No. 2 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 2 engine


engine

Bypass

valve

Engine driven

fuel pump

Crossfeed valve

Fuel shutoff

valves (3)

Center left

pump inlet

Center right

pump inlet

Center left

pump

Center rightpump

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As previously stated, the main tank and center tank check valves open at a boost pump pressure of approximately

12 and 1.3 psi, respectively. Therefore, assuming fuel in all three tanks and all six pumps operating, fuel is

delivered to the engines from the center tank first due to the lower cracking pressure of the check valves.

No. 1


fuel tank

No. 2

fuel tank


fuel tank


Fueling receptacle


No. 1 fwd

pump

No. 1 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 1 engine


engine

Bypass

valve

Engine driven

fuel pump

Fuel temperature

indicatorNo. 2 fwd

pump

No. 2 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 2 engine


engine

Bypass

valve

Engine driven

fuel pump

Crossfeed valve

Center left

pump inlet

Center right

pump inlet

Center left

pump

Center rightpump

Fuel shutoff

valves (3)

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The center tank fuel LOW PRESSURE lights will illuminate when the respective fuel


lights will extinguish when the respective fuel pump switch is OFF.

No. 1


fuel tank

No. 2

fuel tank


fuel tank


Fueling receptacle


No. 1 fwd

pump

No. 1 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 1 engine


engine

Bypass

valve

Engine driven

fuel pump

Fuel temperature

indicatorNo. 2 fwd

pump

No. 2 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 2 engine


engine

Bypass

valve

Engine driven

fuel pump

Crossfeed valve

Center left

pump inlet

Center right

pump inlet

Center left

pump

Center rightpump

Fuel shutoff

valves (3)

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A center tank fuel scavenge system is installed to drain unusable fuel from the center tank into

the No. 1 tank. This occurs when both center tank pump switches are positioned to OFF. This

action sends an electrical signal to the scavenge valve to open for a time period of 20 minutes.

No. 1


fuel tank

No. 2

fuel tank


fuel tank


Fueling receptacle


No. 1 fwd

pump

No. 1 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 1 engine


engine

Bypass

valve

Engine driven

fuel pump

Fuel temperature

indicatorNo. 2 fwd

pump

No. 2 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 2 engine


engine

Bypass

valve

Engine driven

fuel pump

Crossfeed valve

Center left

pump inlet

Center right

pump inlet

Center left

pump

Center rightpump

Fuel shutoff

valves (3)

Scavenge

inlet

Scavenge

valve

Center tank

scavenge jet

pump

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With the scavenge valve now open, fuel from the No. 1 fwd pump flows to the center tank scavenge jet pump. This results in low pressure being

created in the scavenge inlet. Remaining fuel in the center tank is now drawn out and drained into the No. 1 tank. The scavenge valve will close

at the end of 20 minutes. The scavenge valve may be re-opened, for 20 minutes, by cycling the center pump switches to ON and back OFF.

No. 1


fuel tank

No. 2

fuel tank


fuel tank


Fueling receptacle


No. 1 fwd

pump

No. 1 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 1 engine


engine

Bypass

valve

Engine driven

fuel pump

Fuel temperature

indicatorNo. 2 fwd

pump

No. 2 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 2 engine


engine

Bypass

valve

Engine driven

fuel pump

Crossfeed valve

Center left

pump inlet

Center right

pump inlet

Center left

pump

Center rightpump

Scavenge

inlet

Scavenge

valve

Center tank

scavenge jet

pump

Fuel shutoff

valves (3)

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Fuel may be delivered to the APU from any one of the three tanks. The APU fuel shutoff

valve controls delivery of fuel to the APU. The valve is opened and closed by the APU

start switch. Pulling the APU fire switch will also close the APU fuel shutoff valve.

No. 1


fuel tank

No. 2

fuel tank


fuel tank


Fueling receptacle


No. 1 fwd

pump

No. 1 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 1 engine


engine

Bypass

valve

Engine driven

fuel pump

Fuel temperature

indicatorNo. 2 fwd

pump

No. 2 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 2 engine


engine

Bypass

valve

Engine driven

fuel pump

Crossfeed valve

Center left

pump inlet

Center right

pump inlet

Center left

pump

Center rightpump

Scavenge

inlet

Scavenge

valve

Fuel shutoff

valves (3)

To APU

APU fuel

shutoff

valve

Center tank

scavenge jet

pump

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With no AC power available to the aircraft, all six fuel pumps are inoperative. If attempting to start the APU with no AC power on

the aircraft, the fuel pumps are not available to feed fuel to the APU. Therefore, an APU bypass valve is located in the No. 1 fuel

tank which allows fuel to be drawn out of the tank for APU operation. The APU cannot draw fuel out of the No. 2 or center tank.

No. 1


fuel tank

No. 2

fuel tank


fuel tank


Fueling receptacle


No. 1 fwd

pump

No. 1 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 1 engine


engine

Bypass

valve

Engine driven

fuel pump

Fuel temperature

indicatorNo. 2 fwd

pump

No. 2 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 2 engine


engine

Bypass

valve

Engine driven

fuel pump

Crossfeed valve

Center left

pump inlet

Center right

pump inlet

Center left

pump

Center rightpump

Scavenge

inlet

Scavenge

valve

To APU

APU fuel

shutoff

valve

Center tank

scavenge jet

pump

Fuel shutoff

valves (3)

APU bypass

valve

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The manual defueling valve is located inboard of the pressure fueling station on the right wing front spar. It controls fuel flow from the fuel

manifold to the pressure fueling station. It is used to defuel any one of the three tanks, or to transfer fuel from tank to tank (on the ground

only). The handle of the defueling valve is such that its access door cannot be closed when the defueling valve is in the open position.


No. 1


fuel tank

No. 2

fuel tank


fuel tank


Fueling receptacle


No. 1 fwd

pump

No. 1 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 1 engine


engine

Bypass

valve

Engine driven

fuel pump

Fuel temperature

indicatorNo. 2 fwd

pump

No. 2 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 2 engine


engine

Bypass

valve

Engine driven

fuel pump

Crossfeed valve

Center left

pump inlet

Center right

pump inlet

Center left

pump

Center rightpump

Scavenge

inlet

Scavenge

valve

To APU

APU fuel

shutoff

valve

Center tank

scavenge jet

pumpAPU bypass

valve

Fuel shutoff

valves (3)

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Although not shown in the schematic above, overwing fill ports (for gravity fueling) are provided for the No. 1 and No.

2 fuel tanks. These receptacles would be utilized if pressure fueling facilities are not available. If fuel is desired in the

center tank during this type of scenario, fuel must be transferred from the main tanks via the manual defueling valve.


No. 1


fuel tank

No. 2

fuel tank


fuel tank


Fueling receptacle


No. 1 fwd

pump

No. 1 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 1 engine


engine

Bypass

valve

Engine driven

fuel pump

Fuel temperature

indicatorNo. 2 fwd

pump

No. 2 aft

pump

Engine fuel

shutoff valve

When pulled,

closes No. 2 engine


engine

Bypass

valve

Engine driven

fuel pump

Crossfeed valve

Center left

pump inlet

Center right

pump inlet

Center left

pump

Center rightpump

Scavenge

inlet

Scavenge

valve

To APU

APU fuel

shutoff

valve

Center tank

scavenge jet

pumpAPU bypass

valve

Fuel shutoff

valves (3)

This concludes the review of the Fuel Schematic. The next section

will discuss various fueling related panels. Click Next to continue.

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Fuel Control Panel

Forward Overhead Panel

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Fuel Control PanelFUEL VALVE CLOSED lights:

Illuminated bright blue

Related engine fuel shutoff valve in transit.

Related engine fuel shutoff valve position

disagrees with start lever or engine fire warning

switch position.

Illuminated dim blue Related engine fuel shutoff valve is closed.

Extinguished

Related engine fuel shutoff valve is open.

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Fuel Control PanelFUEL TEMP Indicator:

Indicates fuel temperature in the No. 1

fuel tank only.

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Fuel Control PanelFILTER BYPASS Lights:

Illuminated

Impending fuel filter bypass on respective engine

due to a contaminated filter.

Note: During a FILTER BYPASS, fuel is routed

around the filter and delivered to the engine

unfiltered.

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Fuel Control PanelCROSSFEED Selector:

Controls fuel crossfeed valve.

Open

Connects left and right fuel manifold.

Closed

Isolates left and right fuel manifold.

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Fuel Control PanelCrossfeed VALVE OPEN light:

Illuminated bright blue

Crossfeed valve in transit.

Crossfeed valve and CROSSFEED selector

disagree.

Illuminated dim blue

Crossfeed valve is open.

Extinguished

Crossfeed valve is closed.

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Fuel Control PanelCTR Tank Fuel Pump Switches (L and R):

ON

Activates respective center tank fuel pump.

OFF

Deactivates respective center tank fuel pump.

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Fuel Control PanelCenter Tank Fuel Pump LOW PRESSURE Lights:

Illuminated

Respective fuel pump switch is ON and output

pressure is low.

Extinguished


pressure is normal. Respective fuel pump switch is OFF.

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Fuel Control PanelMain Tank Fuel Pump Switches (FWD and AFT):

ON

Activates respective main tank fuel pump.

OFF

Deactivates respective main tank fuel pump.

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Fuel Control PanelMain Tank Fuel Pump LOW PRESSURE Lights:

Illuminated


pressure is low.

Respective fuel pump switch is OFF.

Extinguished

Respective fuel pump switch is ON and outputpressure is normal.

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Fuel Quantity Indications

Instrument Panels

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Fuel Quantity IndicationsFuel Quantity Indicators:

Indicates total weight of usable fuel in respective

tank.

AC standby power is required.

Segmented arc indicates fuel quantity as a

percentage of fuel capacity.

Note: There are many different types of fuelquantity indicators. The type installed in your

aircraft may not necessarily match the type

discussed in this presentation. The type shown

here is manufactured by Simmonds.

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Fuel Quantity IndicationsERR Indicator:

ERR appears with associated error codes (0-9)

whenever a malfunction occurs.

Used for maintenance purposes only

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Fuel Quantity IndicationsFuel QTY TEST Switch:

Press and hold

Fuel quantity indicators display a value of 0.

ERR 4 is shown.

When switch is released, a self test is initiated

All segments of the indicators display for two

seconds. All segments of the indicators extinguish for two

seconds.

Indicators display full tank capacity and stored

error codes, if any, for two seconds.

Indicators return to actual fuel quantity.

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Measurement/Fueling/Defueling

Dripstick

(five on each wing)

Pressure fueling station

Defueling valve

See picture of

fuel tank access panel

and dripstick head
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Fuel Measuring Stick:

Utilized to measure fuel quantity in the No. 1 and

No. 2 fuel tanks. No dripsticks associated with

the center fuel tank.

Allows a comparison of fuel weight (as indicated

by the fuel quantity indicators) to the value

shown on the measuring sticks to ensure the

indicators are operating normally. Five sticks installed on each main tank.

Reading is obtained by turning the head of the

dripstick 90 in a counter-clockwise direction.

Slowly lower the stick until fuel begins to drip

from the hole located near the bottom of the

stick. Quantity may now be determined by

reading the measuring units on the stick. Thisprocedure is best performed by trained

maintenance personnel.

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Pressure Fueling Station:

Provides all the necessary switches,

indicators, and valves to quickly fuel all three

tanks.

Located on right wing, aft of leading edge

slats.

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Fueling Receptacle:

Connects the fueling hose to the pressure

fueling system.


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Fueling Shutoff Valves:

Controls fuel distribution to their respective tank.

Electrically (DC) activated.

Solenoid actuated, spring-loaded to the closed

position.

Left-half of pressure fueling station

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Manual Override Push Buttons (Solenoid Override):

Utilized if DC power is not available to the fueling

shutoff valves.

Mechanically opens shutoff valve when fuel

pressure is supplied.


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Fueling Power Control Switch:

Door closed

Proximity sensor deactivates DC power to fueling

valve switches and panel floodlights. Also

deactivates AC power to refuel quantity indicators.

Door open

Proximity sensor allows DC power to fueling valveswitches and panel floodlights. Also allows AC

power to the refuel quantity indicators.


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Test Gauges and Fueling Panel:

Used by fueling personnel to coordinate the

distribution of fuel to the tanks.

Right-half of pressure fueling station

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Fueling Valve Switches:

OPEN

Energizes fueling shutoff valve for respective tank.

CLOSED

De-energizes fueling shutoff valve for respective

tank.

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Fueling VALVE POSITION LIGHTS:

Illuminated

Respective fueling valve switch in in the OPEN

position and the related tank is not full.

Extinguished

Respective fueling valve switch in in the OPEN

position and the related tank is full. Respective fueling valve switch is in the CLOSED

position.

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Refuel Quantity Indicators:

Indicates total weight of usable fuel in respective

tank.

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TEST GAUGES and FUELING CONTROL Switch:

(spring-loaded to OFF)

TEST GAUGES

Checks the operation of the refuel quantity

indicators by performing a self-test.

AUX POWER FUELING CONTROL

Energizes the fueling system if the fueling powercontrol switch should fail to operate when the

fueling door is open.

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Manual Defueling Valve:

Open

Connects fuel manifold to pressure fueling station

for defueling or to transfer fuel from tank to tank.

Transferring of fuel from tank to tank can only be

performed while the aircraft is on the ground.

Closed (picture shows handle in closed position)Isolates fuel manifold from pressure fueling

station.

Note: The handle of the defueling valve is such

that its access door cannot be closed when the

defueling valve is in the open position.

This concludes the review of the fueling related panels. The remainder

of the presentation will discuss more details of the fuel system.

Click Next to continue.

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Fuel Pump LOW PRESSURE Lights

The fuel pump switches normally

remain in the OFF position until the

pumps are needed.

With the No. 1 and No. 2 tank fuel pump

switches in the OFF position, it is

normal for LOW PRESSURE lights to be

illuminated.

With the center tank fuel pump switches

in the OFF position, it is normal for

LOW PRESSURE lights to be

extinguished. The reason for this is

because the center tank is not always

scheduled to be fueled. Therefore, the

pumps are not utilized and the pump

switches are selected OFF. The LOW

PRESSURE lights would be a nuisance

to the pilots if they were to remain

illuminated with the center pump

switches in the OFF position.

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The following assumes all six fuel

pumps are operating normally and all

three tanks have been fueled:

When the No. 1 and No. 2 tank pumps

are selected ON, the LOW PRESSURE

lights extinguish.

When the center tank pumps are

selected ON, the LOW PRESSURE lights

remain extinguished.

Recall that with all six pumps operating,

fuel is delivered to the engines from the

center tank first.

Fuel Pump LOW PRESSURE Lights

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The following scenarios will

demonstrate the relationship between

the fuel LOW PRESSURE lights and the

master caution system.

Lets first discuss the LOW PRESSURE

lights in the center fuel tank.

Fuel Pump LOW PRESSURE LightsWhen their illumination results in a Master Caution

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Lets assume that the center left pump

has failed. Because the pump is no

longer a provider of fuel pressure, the

respective LOW PRESSURE light

illuminates. This does not result in a

MASTER CAUTION because with both

center pumps ON, both LOW

PRESSURE lights must be illuminatedin order for the MASTER CAUTION and

FUEL annunciator lights to

automatically illuminate.

As a result of the center left pump

failure, the No. 1 tank pumps will begin

to feed the No. 1 engine. However, it is

likely that the non-normal procedurewill suggest opening the crossfeed

valve to allow the center right pump to

deplete center tank fuel. This will also

help to prevent a fuel imbalance

(reference your company operations

manual).


MASTER CAUTION and left

system annunciator panel

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If a pilot were to push either system

annunciator panel, the MASTER

CAUTION and FUEL annunciator would

illuminate to warn the pilots of the low

pressure situation in the center left

pump.

Note: The system annunciator panelsare also known as recall panels.




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The master caution system may be

reset by simply depressing either

MASTER CAUTION PUSH TO RESET

light.




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When the pilot selects the center left

pump switch OFF, the LOW PRESSURE

light extinguishes.




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Now, lets assume that the center right

pump has failed. The respective LOW

PRESSURE light illuminates. The

MASTER CAUTION and FUEL

annunciator lights also illuminate. With

one center pump ON and one center

pump OFF, the illumination of one LOW

PRESSURE light will automaticallyilluminate the MASTER CAUTION and

FUEL annunciator.

In this scenario, fuel is no longer being

delivered to the engines from the center

tank, and therefore the pumps in the

No. 1 and No. 2 tank will automatically

begin to feed the engines.




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When the pilot selects the center right

pump switch OFF, the LOW PRESSURE

light extinguishes.




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light.

This concludes the discussion of the

LOW PRESSURE lights in the centertank. The LOW PRESSURE lights in the

No. 1 tank will be discussed next.




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Lets assume that the AFT pump in the

No. 1 tank has failed. Because the

pump is no longer a provider of fuel

pressure, the respective LOW

PRESSURE light illuminates. This does

not result in a MASTER CAUTION

because both LOW PRESSURE lights in

the No. 1 fuel tank must be illuminatedin order for the MASTER CAUTION and






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If a pilot were to push either system

annunciator panel, the MASTER



pressure situation in the No. 1 tank AFT

pump.




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light.




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When the pilot selects the No. 1 tankAFT pump switch OFF, the LOW

PRESSURE light remains illuminated.




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Now, lets assume that the FWD pump inthe No. 1 tank has failed. The


illuminates. The MASTER CAUTION

and FUEL annunciator lights also

illuminate because both LOW

PRESSURE lights in the No. 1 fuel tank

are illuminated.

The No. 1 engine would continue to run

because the engine driven fuel pump is

drawing fuel out of the No. 1 tank via the

bypass valve.




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When the pilot selects the No. 1 tankFWD pump switch OFF, the LOW





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The master caution system may bereset by simply depressing either


light.


LOW PRESSURE lights in the No. 1tank. The LOW PRESSURE lights in the

No. 2 tank will be discussed next. You

will discover that the No. 1 and No. 2

tank LOW PRESSURE lights function

exactly the same.



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Lets assume that the AFT pump in theNo. 2 tank has failed. Because the

pump is no longer a provider of fuel

pressure, the respective LOW

PRESSURE light illuminates. This does

not result in a MASTER CAUTION

because both LOW PRESSURE lights in

the No. 2 fuel tank must be illuminatedin order for the MASTER CAUTION and






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If a pilot were to push either systemannunciator panel, the MASTER



pressure situation in the No. 2 tank AFT

pump.




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light.




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When the pilot selects the No. 2 tankAFT pump switch OFF, the LOW





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Now, lets assume that the FWD pump inthe No. 2 tank has failed. The


illuminates. The MASTER CAUTION

and FUEL annunciator lights also

illuminate because both LOW

PRESSURE lights in the No. 2 fuel tank

are illuminated.

The No. 2 engine would continue to run

because the engine driven fuel pump is

drawing fuel out of the No. 2 tank via the

bypass valve.




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When the pilot selects the No. 2 tankFWD pump switch OFF, the LOW





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light.


LOW PRESSURE lights in the No. 2tank.



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Fuel Pump Power Sources

MAIN BUS 1

TRANSFER BUS 1 TRANSFER BUS 2

MAIN BUS 2MAIN BUS 1

MAIN BUS 2

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Fuel Tank Capacities

No. 1 tank No. 2 tank

Center

tank

1,499 U.S. gallons

10,118 pounds*

4,650 KG

*Fuel density assumed to be 6 75lbs/gallon

1,499 U.S. gallons

10,118 pounds*

4,650 KG

2,313 U.S.

gallons

15,613

pounds*

7.176 KG

These figures represent the approximate amount of useable fuel. Weight and balance

calculations and the appropriate loading manual will give exact figures for your

specific aircraft and condition.

fuel r 01

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