The ornamental design for a fuel gas can vent cap, as shown and described.
FIG. 1 is a perspective view of a fuel gas can vent cap showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a back elevational view thereof;
FIG. 4 is a right-side elevational view thereof;
FIG. 5 is a left-side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a perspective view of the fuel gas can vent cap of FIG. 1 shown in a position of use connected to an unclaimed fuel gas can drawn in broken lines.
The broken lines illustrating a fuel gas can in FIG. 8 depict environment and form no part of the claimed design. All other broken lines depict portions of the fuel gas can vent cap that form no part of the claimed design.