Fuel Monitoring with GPS Trackers: How UK Fleets Cut Fuel Costs

Joseph Cimand
20 hours ago
2 min read

Fuel is typically the largest controllable cost in any fleet — often 30–40% of total running expenses. Modern GPS trackers with fuel monitoring give fleet managers the data to identify waste, reduce unnecessary consumption, and catch fuel theft before it becomes a significant loss. Here is how it works and what you can expect to save.

Fleet vehicle being refuelled — GPS trackers with fuel monitoring help UK fleets cut fuel costs

How Do GPS Trackers Monitor Fuel?

There are two main methods. CAN bus integration: Teltonika and Queclink GPS trackers with CAN bus support connect directly to the vehicle's data network and read the onboard fuel consumption figure in real time, providing accurate per-journey and per-driver fuel data straight from the vehicle ECU. External fuel sensors: a sensor installed in the tank sends continuous fuel level readings to the tracker, enabling detection of sudden drops that indicate theft or a fuel system fault alongside normal consumption tracking.

What Fuel Data Can You Access?

With CAN bus-equipped GPS trackers from Tracking Hardware, fleet managers can access fuel consumed per journey and per driver, average consumption in litres per 100km or miles per gallon, total idle time and the fuel burned during idling, sudden fuel level drops indicating theft or fault, and efficiency trends over time. Combined with driver identification keypads, every litre of fuel consumed can be attributed to a specific named driver — enabling fair, data-backed performance conversations.

The Real Cost of Idling

Idling — leaving an engine running unnecessarily — is one of the most wasteful habits in fleet operations. A typical diesel van burns around 0.8–1.2 litres per hour at idle. For a 20-van fleet with just 30 minutes of unnecessary idling per vehicle per day, that is more than 3,000 litres of wasted fuel per year — roughly £4,500 at current UK diesel prices. GPS trackers report idle time per vehicle and per driver, allowing managers to address this directly through driver coaching or automated idle-time alerts.

Detecting Fuel Theft

Fuel theft — siphoning from a vehicle tank or misusing a company fuel card — is a real risk for UK fleets. GPS trackers with fuel sensor integration report fuel level continuously. A sudden drop in level when the vehicle is stationary and the engine is off is a clear indicator of theft. Fleet managers can configure instant alerts for anomalous fuel level changes, enabling rapid investigation before significant losses accumulate.

Which GPS Trackers Support Fuel Monitoring?

Teltonika devices with CAN bus support include the FMC130, FMC150, and FMC640, among others. For external fuel sensors, most Teltonika and Queclink devices support 1-Wire or analogue input connections for fuel level sensors. Tracking Hardware stocks the full range and can recommend the right device for your vehicle type, telematics platform, and fuel monitoring requirements.

All Teltonika and Queclink devices we supply are fully unlocked — not tied to any specific telematics platform or fleet management software. You are free to use them with any compatible platform.