The ornamental design for a fueltank, as shown and described.
FIG. 1 is a front perspective view of a fuel tank embodying my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken line showing of the underside of a vehicle is provided for the purpose illustrating environmental structure and forms no part of the claimed design.