It appears each wing on a 737-700 can carry a little over four tons of fuel.
http://www.airliners.net/forum/viewtopic.php?t=1359825
Looks more like 10 tons of fuel on each wing of a 737.
It’s still not clear to me where the fuel tank is in the fuselage.
The A380 Airbus carries, get this, half a million pounds of fuel. That’s right.
None of this makes sense.