an over ride oil pump for use with reciprocating or rotary engines which provides auxiliary oil pumping under three circumstances by use of an electrically operated oil pump , digital circuitry and sensors . as a car is started the standard mechanical oil pump cannot provide adequate lubrication since the mechanical pump can only pump at a rate proportional to engine speed . the over ride pump begins immediately , upon initiation of engine start up . under conditions of high rpm operation extra lubrication is required . the over ride oil pump senses increased vacuum levels and provides additional oil delivery . oil pressure drops rapidly if there is a failure in the mechanical pump drive mechanism or the pump itself . the over ride oil pump senses this deficiency and provided the necessary oil delivery .