Fuel Tank Cap

FIG. 1 is a top perspective view of a fuel tank cap showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. S is a right side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a bottom perspective view thereof.

Broken lines in the drawings depict portions of the fuel tank cap that form no part of the claimed design.