The present invention provides system (100) for securing fuel of motor vehicles using IoT devices. The system comprises control device (101) mounted on lid of fuel tank to control the opening and closing of the lid of the fuel tank, from remote places. The control device (101) comprises plurality of IoT sensors connected to a microcontroller unit (205), a GSM module (202) to transfer the data between the authorized user and control device (101). The control device (101) also comprises microcontroller unit (205) to execute the plurality of operations and motor (207) integrated with microcontroller unit (205) to lock or unlock the lid of the fuel tank on receiving the signal from authorized user. An application is installed onto the user's mobile device (104) to monitor and track the activities in fuel tank. A cloud based database server (103) is used for storing and analyzing the measured fuel data.