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A by-pass suction valve is installed in the engine
feed line. In the event of complete failure of both
main pumps, the suction valve allows the engines to
be fed by gravity.
CROSSFEED VALVE
A CROSSFEED VALVE permits connection of the left and
right engine supply lines. The crossfeed valve is
normally closed.
LP VALVES
The Low Pressure valves isolate the engines or APU
from the fuel supply.
The LP valve is open when the related engine or APU
is running; it closes when engine or APU is shut down
or ENG FIRE pushbutton is released out.
PRESSURE SWITCHES
A pressure switch for each main pump monitors the pump
pressure for the low pressure warning. APU pressure
switch is used for APU fuel pump control.
AIR RELEASE VALVE
Each engine supply line has an Air Release Valve at
its highest point to enable the line to be bled.
CENTER TANK XFR VALVES
Two center tank XFR valves are installed at the bottom
skin of the center tank.
They are used to transfer fuel from center tank to
wing tanks through the jet pumps.
JET PUMPS
The jet pumps use fuel flow from the main pumps as
operating pressure to transfer the fuel from center
tank to the related wing tank.
NOTE: In case of a main transfer system failure, (e.g:
transfer valves jammed closed) fuel will
transfer from center tank to wing tank by
gravity.
Gravity feeding will take place only if the level
of fuel in the center tank is greather than the
level in the wing tanks. Approximately 2000 kg
(4400 lbs) of center tank fuel will not move to
the wing tanks in the gravity feed configuration.
APU PUMP
A specific fuel pump supplies the APU if the LH main
pumps are not operating. This pump takes fuel from the
left supply line.
TMUFUE102-T01 LEVEL 1
EFFECTIVITY 28-20-00 Page 10
Jul 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 294
ALL
ENGINE AND APU FUEL FEED PRESENTATION
TMUFUE102-P01 LEVEL 1
EFFECTIVITY 28-20-00 Page 11
Jul 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 295
ALL
SELF EXAMINATION
Are main pumps running while center tank is
transfering?
A - Yes, main pumps are always running.
B - No, only when center tank is empty.
C - No, because of center tank pump priority.
The engine LP valve closes when:
A - The fuel booster pump pressure decreases.
B - The engine is shut down or the ENG FIRE
pushbutton is released out.
C - The engine fire detection system detects
an engine fire.
The APU can normally be supplied with fuel by:
A - Only the APU pump.
B - Only the LH main pumps.
C - LH main pumps or APU fuel pump.
TMUFUE102 LEVEL 1
EFFECTIVITY 28-20-00 Page 12
Jul 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 296
ALL
28 - FUEL SYSTEM
28-20-00 FUEL SYSTEM CONTROLS
CONTENTS:
Crossfeed
Tank Pumps
Center Tank Transfer
Mode Selector
TMUFUE302 LEVEL 1
EFFECTIVITY 28-20-00 Page 13
Apr 31/94
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 297
ALL
FUEL SYSTEM CONTROLS
CROSSFEED
The X FEED pushbutton controls the crossfeed valve.
This pushbutton is normally released out and the
crossfeed valve is closed.
If the pushbutton is pressed in, the valve opens and
the ON light comes on white. The green OPEN light comes
on when the valve is fully open.
TANK PUMPS
When a wing tank pushbutton is pressed in, the related
pump runs.
The FAULT light comes on amber associated with an ECAM
caution if the main pump pressure is too low.
CENTER TANK TRANFER
With the CTR TK L(R) XFR transfer pushbutton pressed
in, the transfer valve will be controlled automatically
if the auto mode is selected.
In MAN mode, the transfer valve is manually switched
on or off by the related pushbutton.
The FAULT light comes on amber associated with ECAM
caution in case of associated wing tank overflow.
MODE SELECTOR
The MODE SEL pushbutton sets the center tank transfer
valves to automatic or manual mode.
The FAULT light comes on amber associated with an ECAM
caution in case of automatic transfer failure.
TMUFUE302-T01 LEVEL 1
EFFECTIVITY 28-20-00 Page 14
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