Abstract: An automatic fluid injector for accurately injecting preselected quantities of fluid specimens into an inlet of analytical instrument. The overall combination includes (a) the fluid injector sub-assembly, (b) an injector feed assembly for automatically continuously purging, cleaning and filling the barrel of said fluid injector sub-assembly and (c) a magazine, or feed tray, for transporting one or a plurality of vials of fluid specimens to the injector feed assembly for pick-up of the fluid specimen, and delivery to the barrel of said fluid injector sub-assembly. A feature of the invention is that fluid specimen can be passed from the extreme rearward end of the barrel of the fluid injector sub-assembly, entirely through the barrel and needle to purge, clean and remove contaminants as from previous specimens.