FIG. 1 is a top plan view of an ornamental design for a fuel injector cleaner block of the present invention;
FIG. 2 is a front view of an ornamental design for a fuel injector cleaner block of the present invention;
FIG. 3 is a right side view of an ornamental design for a fuel injector cleaner block of the present invention;
FIG. 4 is a rear view of an ornamental design for a fuel injector cleaner block of the present invention;
FIG. 5 is a left side view of an ornamental design for a fuel injector cleaner block of the present invention;
FIG. 6 is a bottom plan view of an ornamental design for a fuel injector cleaner block of the present invention;
FIG. 7 is a top isometric view of an ornamental design for a fuel injector cleaner block of the present invention; and,
FIG. 8 is a bottom isometric view of an ornamental design for a fuel injector cleaner block of the present invention.
The broken line shown in the drawings are for the purpose of illustrating portions of the article that form no part of the claimed design.