In this contribution, NR/FKM blended with blend ratio of 70/30 with and without the third component, ENR or PI-ME was prepared. The curing characteristics, morphology, mechanical properties, and automotive fuel resistance of the rubber blends were investigated. Form the curing characteristics investigation, the cure time and scorch time of the blends with the third component were found to be longer than those of the blends without the third component. Adding ENR did not have a remarkable effect on the morphology of NR/FKM blend but the addition of PI-ME appeared to increase roughness of the blend. The mechanical properties and automotive fuel resistance of the blend rubbers were found to increase with adding 10 phr of ENR due to sufficient ENR content for enhanced interaction between NR and FKM. In contrary results, adding PI-ME into the NR/FKM decreased the mechanical properties and automotive fuel resistance of the blend rubbers especially at 10 phr. From the results, it has been concluded that ENR could function as a third component that link NR and FKM phases in the blend system study. The optimum content of ENR was 10 phr.