BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a cross sectional view through an injector according to the present invention,

FIG. 2 shows a cross sectional view through one possible arrangement of a governor or accelerator for use in controlling operation of the injector,

FIG. 3 is a cross sectional view through an alternative construction of injector according to the present invention,

FIG. 4 is a cross sectional view through the rear portion of a further possible construction of injector showing various means for enabling control of the injector operation

FIG. 5 is a plan view of the detailed section marked "A" in FIG. 4, and

FIG. 6 is a sectional view along the line VI--VI in FIG. 4.