The invention relates to a common rail for a common rail fuel injection system of an internal combustion engine, having a tubular base body whose interior communicates with a plurality of connections. To increase the high-pressure strength, the interior is formed by at least two substantially circular-cylindrical recesses or bores which communicate with one another and whose longitudinal axes are parallel to one another. The connections originate only at the jacket face of one of the substantially circular-cylindrical recesses.

A fuel rail assembly for supplying fuel to a plurality of fuel injectors in an engine is provided. This assembly comprises an elongated conduit having a longitudinal fuel passage therein, a fuel inlet pipe fixed to an end or a side of the conduit, and a plurality of branch pipes. The basal end of each branch pipe is adapted to communicate with the fuel passage. The distal end of each branch pipe is provide with a connecting member for connecting to a tip of a fuel injector. The wall of the conduit is provided with holes for receiving the basal ends of the branch pipes. Around each hole an inner collar and an outer collar are integrally formed with the conduit wall, and each branch pipe is fixed to the collars by brazing or welding. The drilling work is performed by a special drilling tool.

The invention relates to a high pressure fuel accumulator for an accumulator injection system in internal injection engines, comprising a base body which is provided with a longitudinal recess which has a plurality of connecting bores emanating therefrom. The inner chamber of the longitudinal recess is essentially cylindrical in shape and has at least one rib shaped section on the inner perimeter of the longitudinal recess into which a connecting bore formed in the longitudinal recess leads.