High-pressure pump for a fuel system of an internal combusion engine

A piston pump (20), in particular a high-pressure pump for a fuel system of an internal combustion engine, includes a housing (72). In addition, a piston (94) is provided, which defines a working chamber 100. A drive shaft (78) is supported in the housing (72) by means of at least one shaft bearing and has at least one crank section (86). A piston bearing supports the piston (94) at least indirectly against the crank section (86) of the drive shaft (78). At least one of the bearings between parts that move in relation to one another is a hydrostatic bearing (62). This hydrostatic bearing is connected to the working chamber (100) by means of a fluid connection. In order to increase the efficiency of the piston pump (20), the invention proposes that the fluid connection between the working chamber (100) and the hydrostatic bearing (62) be provided with a device (56; 118) that can intermittently interrupt the fluid connection.