Abstract: A variable flow rate oil delivery system for delivering oil to an oil combustion system according to the demand of heat needed by the heating appliance to which the combustion system is installed or according to a set function of time and rate. This oil delivery system incorporates a programmable logic controller that powers a variable speed motor which drives an oil pump that electronically, versus manually, controls the oil fuel flow rate to an oil combustion system. This oil delivery system enables an oil combustion system to start at a low firing rate providing a soft start. This oil delivery system will increase the life span of a heating appliance and improve oil fuel combustion efficiency.