pump tappet of a lifting-disk pump The functions of a lifting-disk pump tappet: filling the pressure chamber start of injection, feed, injection volume control by rotating the plunger. injection start control by means of the movable lifting disk. description ordernumber 1182 see also: Common-rail high pressure pump with fuel-delivery regulation valve and injector vane-type camshaft adjuster air-mass sensor with hot film in-line fuel-injection pump with vacuum governor