This document describes a real-time fuel monitoring and theft detection system using IoT. The system uses a flow sensor to measure the amount of fuel dispensed from fuel stations to detect any discrepancies. An ultrasonic sensor is also used to detect any fuel thefts from vehicles. The measured fuel data is sent to a mobile app and cloud database in real-time. If a theft or fraudulent dispensing is detected, an alert is sent to the owner. The system allows for automated monitoring of fuel levels and detection of theft or fraud incidents with low cost electronic components.