a fuel rail assembly of an internal combustion engine includes an axially extending non - round fuel conduit and at least one axially extending stiffening feature integral with said conduit . integration of the stiffening features in the conduit enables reduction or elimination of the objectionable frequency noise radiated by the fuel rail assembly . by aligning the stiffening features axially relative to the conduit , panels having a relatively small surface area are formed and , thus , the noise radiating surface area is significantly reduced . the axial orientation of the added stiffening features allows the length of the stiffening features to be relatively large , which increases the stiffening effects to provide increased resistance to flexing , thus , reducing the noise radiated by the fuel system of the internal combustion engine .