FIG. 1 is a top, front and side perspective view of a fuel canister with refillable dosage valve, showing our new design; FIG. 2 is a front elevational view thereof; FIG. 3 is a side elevational view thereof from the right of FIG. 2, the side elevational view thereof opposite FIG. 3 being a mirror image thereof; FIG. 4 is a rear elevational view thereof; FIG. 5 is a top plan view thereof; and, FIG. 6 is a bottom plan view thereof.