Apparatus for supplying fuel to a combustion engine

Claim 1

Apparatus for incorporation into the induction system of an internal combustion engine adapted to burn liquid fuel in a vapor form, which induction system includes a primary fuel vaporization means and a fuel vapor inlet tract having walls and an axis, said apparatus comprising a body inserted into said fuel vapor inlet tract intermediate of said primary fuel vaporization means and the combustion chamber of said engine, said body comprising a first portion defining a first aperture converging in the direction of fuel vapor flow and a second portion defining a second aperture having an inlet substantially coindent with the outlet of said first aperture, said second aperture diverging in the direction of fuel vapor flow, the inlet to said first aperture and the outlet from said second aperture being arranged to substantially conform with the walls of said fuel vapor inlet tract at their points of juncture, said members defining said first aperture subtending an angle of not greater than 45° with the axis of said inlet tract at the inlet to said first aperture and said members defining said second aperture subtending an angle of not greater than 20° with the axis of said inlet tract at the outlet from said second aperture so as to not significantly increase the level of turbulence in the fuel vapor passing through said fuel vapor inlet tract.