Abstract: A fuel metering apparatus is shown as having a throttle body with an induction passage therethrough and a throttle valve for controlling the flow of air therethrough; associated fuel metering and control apparatus is shown operatively connected to individual fuel injection valve assemblies respectively associated with respective cylinders of an internal combustion engine; such fuel injection valve assembly is shown as being constructed as to be capable of disassembly thereby enabling the replacement of components thereof, as need replacement, without the necessity of having to replace the entire fuel injection valve assembly when only a portion thereof actually needs replacement.