High pressure fuel system for combustion engines

The high pressure fuel system, for an internal combustion motor, has at least two high pressure bodies (1,3) pressed together at their facing surfaces (10,12). A high pressure fuel channel (17) at the bodies, passes between their facing surfaces. One surface carries a ring step (5) around the fuel passage, with a sealing surface (15) at the end side at the other surface. At least one flank (7,9) of the ring step is at an angle ( alpha ) of ≥ 0 degrees to the normal of the sealing surface, to reduce the notch tension for increased stability.