ACT 1  ACT 2  ACT 3  ACT 4  ACT 5  ACT 6  Total with 6 ACTs 
Volume  Liters  3104  2180  2180  3036  3104  3104  40568 
US Gal  820  576  576  802  820  820  10718 
Weight  Kg  2437  1711  1711  2383  2437  2437  31846 
Lb  5372  3773  3773  5254  5372  5372  70207 

Note: Two fuel operating sequences are available on A319 CJ. ACTs are fueled in the following order : 
.
Seq A: 1, 2, 3, 4, 5 and 6

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Seq B: 1, 2, 4, 6, 3 and 5 and defueled in the reverse order. Please refer to the Weight and Balance Manual for applicable information.

SYSTEMS

B. FUEL SYSTEMS

2.1.3. A321

Note : One or two optional additional center tanks can be fitted (on A321-200 only)
Fuel Capacity (Usable fuel) . density: 0.785kg/L
Wing Tanks  Center Tank  Total without ACT  ACT  Total with 1 ACT  Total with 2 ACTs 
Volume  Liters  7745  8210  23700  2992  26692  29684 
US Gal  2046  2169  6261  790  7052  7842 
Weight  Kg  6080  6445  18605  2349  20954  23302 
Lb  13404  14208  41015  5178  46193  51371 

B. FUEL SYSTEMS

2.2. Fuel System
The standard body family has the simplest fuel systems, as it is neither equipped with a CG control system nor a trim tank. Indeed, the benefits of a CG control system on the much shorter missions of the A320 family aircraft would be negligible compared with the cost related to the installation of a CG control system (maintenance costs and extra weight on board). So, the fuel system only deals with fuel quantities and tank transfer issues. As explained above, some differences can be observed depending on the aircraft type and on the modifications fitted on the aircraft (e.g. ACTs)
2.2.1. Engine feed and fuel transfer
On A318, A319 and A320 aircraft, there are six main pumps: two pumps in the center tank (except A320-100 which has no center tank) and two pumps in each inner tank. Each engine is fed with one pump in the center tank and with the two pumps in its own side inner tank. When inner tanks reach low level, valves between outer and inner open and an automatic gravity transfer occurs.
On A321, each engine is supplied from two pumps in its own side wing tank. Fuel transfers from center tank to wing tanks are managed through a transfer valve.
When aircraft are equipped with ACTs (Additional Center Tanks), fuel transfer is made by pressurization. ACTs are emptied one by one into the center tank.
　
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