Fuel injection system for internal combustion engine

Claim 1

A port injection fuel system for an internal combustion engine comprising an intake manifold having a wall defining an internal passageway through said manifold and having an inlet end and an outlet end, means at said outlet end adapted for attachment to a said engine, said wall having an opening defining a fuel discharge opening near said outlet end, throttle valve means for controlling the flow of air through said intake manifold, said valve means having an open position and a closed position in said manifold to control air flow therethrough, injection nozzle means comprising a slender hollow cylindrical rod disposed centrally across said manifold nearer said inlet end than said valve means and positioned normal to the axis of said intake manifold, said rod having a plurality of spaced bores positioned transverse thereto and axially of said intake manifold, for dispensing vaporized fuel into the air drawn through said intake manifold over said rod, a fuel line connected to said nozzle means, a flow control valve connected to said fuel line to meter the amount of fuel to pass through the line to said nozzle means, said valve comprising a movable valve member and means connected to said valve means for controlling the flow of air and to said valve member to increase the amount of fuel metered to said fuel line and said nozzle means as said throttle valve means is moved to increase the air flow through said intake manifold, means for maintaining fuel in said flow control valve to be metered by said movable valve member to said nozzle means at a pressure sufficient to maintain fuel in said rod across the width of said manifold when said valve means is in said open position; and means for removing air from the fuel line between said means for maintaining fuel in said flow control valve and said flow control valve.