How much fuel does an A380 hold and where?
The total capacity of fuel tanks of Airbus A380 is 320000 liters.

The fuel tanks in Airbus A380 are shown in this image.


Image Source

The capacities of different tanks are1 (in liters):


Tail tank: 23,698
Inner tanks: 90,600
Mid tanks: 72,000
Feed tank 2 and 3: 28,130 each
Feed tank 1 and 4: 26,974 each
Outer tanks: 9,524 each




1 The only place I found this information is in the book Airbus A380: Superjumbo of the 21st Century. Luckily, it is on Google books. This excerpt from the book about the relevant information says:


  The horizontal stabilizer runs through section 19 and includes an integral fuel tank between ribs 8 left and right. The fuel level in the tail tank, which can take up to 23,698 liters, is adjustable in flight for trimming purposes. Overall, the hard-line A380-800 fuel-tank capacity is 315,292 liters, most of which is contained in two inner tanks with more than 90,600 liters. Two other mid-tanks hold about 72,000 liters between them, with inner engine 2 and 3 feed tanks containing 28,130 liters each. The outer engine 1 and 4 feed tanks each hold 26,974 liters, while the two outer tanks each hold 9,524 liters.