This study aimed to design a system which can provide protection in diesel engines of an automobile. The device comprises of External Fuel Tank, Fuel Sensor, Water Sensor, Microcontroller, Solenoid Valves and Audible Alarm. In addition, it sought to determine the efficiency and usefulness of the device for the automobile’s engine security. Furthermore, it is designed to address such problems concerning the incorrect insertion of impure gasoline and diesel fuels on engines. Qualitative and quantitative methods of research were employed to assess the functionality, reliability and accuracy of the findings from the developed system. It helped the researchers to better understand and verify the underlying principles that govern during the making of the project. The implemented system was evaluated, and 92% of the evaluators were highly satisfied with the pure diesel detection. Better assurance and protection were provided with the use of the feedbacks from the users.