is turned on before the injection event begins to precharge or store energy in the inductor 22 the injector driver switch 66 is preferably turned on slightly before the inductor driver switch 60 is turned off and generally only a few hundred microseconds before the inductor driver switch 60 is turned off this insures that the injector driver switch 66 is completely on before the energy stored in the inductor 22 is discharged therefrom so that the energy stored in the inductor 22 will flow immediately to the fuel injector coil 62 when the inductor driver switch 60 is turned off a very small amount of current may flow through the injector coil 62 when the injector driver switch 66 is initially turned on but this does not affect the operation of the injector 12 significant current will flow into the solenoid coil 62 when the inductor driver switch 60 is turned off and the injector driver switch 66 is turned on and the inductor acts as a current source in series with the battery 63 to dump a large current into the solenoid coil 62 as the energy in the inductor 22 is dissipated into the solenoid coil 62 the current in the solenoid coil 62 and the inductor 22 reaches a holding level established by the series combination of the solenoid coil 62 and inductor 22 the inductor 22 must have characteristics so that the current in the injector.