Oil activated fuel injector control valve

An oil activated fuel injector control valve which substantially eliminates captured air within working fluid of the fuel injector (100). This eliminates shot by shot variations in the fuel injector as well as increasing the efficiency of the fuel injector. The fuel injector includes a control valve body (102) which has vent holes (110) which prevent air from mixing with the working fluid. In this manner, the working fluid does not have to compress and/or dissolve the air in the working ports (106) prior to acting on the piston (124) and plunger (126) mechanism in an intensifier body (120) of the fuel injector.