Patent ID: 8746214

Claim:
In a fuel injection system for an internal combustion engine, said fuel injection system comprising: (a) an air passage mechanism where the air passage mechanism comprises a central section; (i) where the central section defines a plenum allowing air passage through the air passage mechanism; (ii) where the central section further comprises a venturi and a throttle valve mounted within the plenum; where flow of air through the air passage mechanism generates an air pressure differential which is the difference between impact pressure and venturi suction pressure; (iii) the air passage mechanism comprising an air pressure differential adjustment mechanism comprising a single venturi suction tube and a shim; where the venturi suction tube is configured to allow measurement of the venturi suction pressure; where the venturi tube is attached to the shim; where the shim is mounted within the plenum and configured to be manipulated to adjust the location of the venturi suction tube to thereby adjust the venturi suction pressure; (b) a fuel pressure modifying mechanism which receives fuel from a supply and delivers the fuel at a pressure different from the supply comprising a fuel regulator and an idle valve; and (c) a fuel metering mechanism.