Any fracture of the fuselage, even if it did not actually break into two or more sections, lets the air out and water in rapidly. It would not float for long. However, it is almost certain that the fuselage forward of the wing box would separate, perhaps even the rear fuselage behind the wing box as well (three sections). Both halves, or all three, would fill with water in seconds.
As for the fuel tanks, even if the wings came clean off at the center section and did not rupture the tanks in a way, the separation of the engines would break the fuel feed pipes at the spar valve, which being open, would let water in and the air would rapidly escape though the tip vents. I doubt a wing would float for more than 15 minutes max.
As for the fuel tanks, even if the wings came clean off at the center section and did not rupture the tanks in a way, the separation of the engines would break the fuel feed pipes at the spar valve, which being open, would let water in and the air would rapidly escape though the tip vents. I doubt a wing would float for more than 15 minutes max.