Distributor-type fuel injection pump

A fuel injection pump of the distributor type for supplying a plurality of fuel injection valves of an internal combustion engine, comprising at least one reciprocatingly driven pump piston (17) that defines a pump work chamber (18) and upon each supply stroke pumps fuel at injection pressure out of this pump work chamber to one of the fuel injection valves, a rotationally driven distributor shaft (11) that upon rotation in the supply stroke of the pump piston (18) establishes communication, via a distributor opening (20) on the circumference of the distributor shaft which communicates constantly with the pump work chamber, between the pump work chamber (18) and a fuel injection valve, and having an electrically controlled switching valve (16) which serves to control fuel injection over a course of the supply stroke of the pump piston (17) and has a valve member (35) that controls a valve opening (33) between a first valve chamber (36) and a second valve chamber (24), wherein the first valve chamber (36) communicates constantly with the distributor opening (20) via a pressure conduit (46) and a connecting line (127) leads from the second valve chamber (24) to a fuel-filled low-pressure chamber (45) and both the filling and relieving of the pump work chamber (18) are effected via this connecting line (127), the second valve chamber (24) adjoins a valve seat (34) of the valve member (35) and is disposed in the distributor shaft (11) coaxially to the axis of the distributor shaft, and the connecting line (127) has a diameter constriction (57).