This document proposes an IoT-based fuel monitoring system for vehicles to avoid financial losses from inaccurate fuel filling records. The system uses a flow sensor activated by fuel flow to calculate the amount filled and notify the owner. It sends the fuel data to the cloud and tracks the filling location via GPS on the user's phone. The system architecture involves a flow sensor, microcontroller, and cloud server for data storage. It aims to allow users to check accurate fuel amounts filled and locations to prevent losses from incorrect records.