NOVELTY - The unit (100) has a cylindrical pressure accumulator wall (108) made of plastic and provided with a fuel inlet (106), a fuel outlet (112) and a pressure measurement port (120). A pressure sensor unit (104) is arranged at the pressure measuring port and comprises a sensor portion (124) that comprises a sensor element, where the sensor element is arranged in a plastic injection-molded sensor housing. The sensor housing is connected to the measuring port at the accumulator wall by a friction welding process. The accumulator wall is provided with a base portion (118).    USE - Pressure accumulator unit for a fuel supply device of an internal combustion engine e.g. V-type direct injection diesel engine and V-type direct injection petrol engine, in a motor car.    ADVANTAGE - The sensor element of the sensor unit is arranged in the plastic injection-molded sensor housing that is connected to the pressure measuring port at the accumulator wall by the friction welding process, thus enabling reduction of manufacturing and assembly time of the unit while enabling functional integration of the sensor unit in the accumulator wall. The utilization of the welding process enables avoidance of a separate connection piece for the pressure measuring port, so that the accumulator has a compact structure and high efficiency. The pressure sensor unit is utilized for different types of accumulator units.    DETAILED DESCRIPTION - The friction welding process is selected from a group consisting of a rotary friction welding process, an ultrasonic welding process, an orbital friction welding process or a friction agitation process. An INDEPENDENT CLAIM is also included for a method for manufacturing a pressure accumulator unit.    DESCRIPTION OF DRAWING(S) - The drawing shows an exploded perspective view of a pressure accumulator unit for a fuel supply device.    Pressure accumulator unit (100)    Pressure sensor unit (104)    Fuel inlet (106)    Cylindrical pressure accumulator wall (108)    Fuel outlet (112)    Base portion (118)    Pressure measurement port (120)    Sensor portion (124)