Most transport companies check fuel the same way: at the end of the month they compare invoices with mileage. The method runs weeks behind and cannot tell theft from high consumption. Yet fuel is usually the second-largest cost after wages, and losses are rarely spectacular. Most often they are small, repeated amounts that add up to a hole in the budget.
The scale of the problem
Industry data for 2022 and 2023 shows a clear upward trend:
- Risk Intelligence recorded 2,313 cargo and fuel theft incidents in Europe in 2022, of which 785 involved fuel directly.
- TAPA EMEA registered 1,526 fuel theft incidents in the first nine months of 2023 alone, across 27 countries.
The countries hit hardest are Germany, the United Kingdom, France, Spain and Italy, all of them everyday destinations for international haulage. Fuel prices are the immediate cause of the rise: the higher they are, the more profitable theft becomes for organised groups.
Four ways fuel disappears
Siphoning from the tank. The classic: a hose and a pump, sometimes a drilled tank or a forced filler cap. It happens at night in unguarded parking areas and takes about a quarter of an hour.
Fuel that never reaches the tank. The invoice says 400 litres, but only 370 reached the tank. The rest went into a canister. This variant leaves no trace in the paperwork, only in the data on how much the level in the tank actually rose.
Fuel card cloning and skimming. More sophisticated groups copy card data and refuel at the company’s expense, sometimes hundreds of kilometres from the vehicle’s route.
Gaming the consumption allowance. The driver blames high consumption on congestion and difficult conditions, while the engine data shows a low load and no idling.
Cutting fuel lines is a category of its own: an invasive method that, on top of the lost fuel, brings repair costs and downtime.
What it costs
A full tank in a tractor unit costs around €3,000. But the value of the fuel is only the first item on the bill:
- vehicle downtime and emergency refuelling on the road, usually at a higher price,
- repairs to the tank, filler cap and fuel lines, sometimes to the electrical system,
- higher insurance premiums after repeated claims,
- delivery delays, followed by conversations with a customer whose load did not arrive on time,
- administrative work: reporting, documentation, explanations,
- strain on the driver, who feels less safe at rest stops after an incident like this.
Why standard GPS tracking is not enough
A standard system shows where the vehicle is parked. It will not answer the three questions that decide whether anyone knows what actually happened:
- Did the sudden drop in fuel level happen while the vehicle was parked or while it was moving?
- Did the fuel disappear from the tank, or did it never get there?
- Is the high consumption on this route down to conditions or to manipulation?
Answering any of them means comparing two independent data sources.
How to detect losses: fuel probe and CAN bus
The fuel probe measures the level of liquid in the tank. The CAN bus reports how much fuel the injectors actually drew. These are two different quantities, and only comparing them gives certainty:
- Theft while parked. A sudden drop in level with the engine off is an event that consumption cannot explain. The system flags it as a possible fuel drain and sends an alert in real time: within minutes, not a month later.
- Losses on the road. If the level in the tank drops clearly more than the consumption reported by the engine would account for, the difference is an irregularity to be explained.
- Refuelling checks. Matching fuel card transactions against the actual increase in litres in the tank catches fuel that never reached the tank on the same day.
- Filtering out false alarms. Fuel sloshes under braking, and the level changes when the vehicle stands on a slope. The algorithms that filter out these effects are what separates a useful alert from a system nobody reads because it goes off ten times a day.
Operational analyses show that stopping theft, combined with less idling and optimised routes, cuts total fuel costs by 5–12%. How the module works is described on the fuel monitoring page.
What else to use
Telematics detects and documents. To cut the number of attempts, a fleet also needs a physical and an organisational layer:
Secure parking. TAPA and ESPORG certification means CCTV, fencing, lighting and access control. The problem is that Western Europe still has too few such sites, so drivers stop wherever their working time runs out.
Tank protection. Locking filler caps, anti-siphon inserts that stop a hose going in without restricting the flow when refuelling, covers for sensors and fuel lines, and independent alarms that go off when the filler is opened.
Fuel card discipline. A PIN for every transaction, daily and weekly limits, real-time notifications and, above all, a check of the transaction location against the vehicle’s position. A card used 200 kilometres from the tractor unit is a signal the system picks up automatically.
Driver training. Choosing where to stop, reporting suspicious situations, knowing what a typical attack looks like. The driver is the only person who is actually there.
What happens beyond the fleet
The fight against fuel theft also runs at industry level. TAPA EMEA works with Europol and Interpol, shares incident data and runs training and security standards (FSR, TSR, PSR). Europol runs periodic operations against the trade in stolen fuel. The Mobility Package does not address theft directly, but it improves the conditions of drivers’ rest and therefore, indirectly, the security of vehicles too.
Where to start
If fuel control today relies on comparing invoices with mileage, the first step is not a purchase but a diagnosis: check on how many vehicles CAN bus data is already available and whether the probes are calibrated. In most fleets it turns out that some of the data is already being collected but nobody compares it, and that is the cheapest source of information a fleet can have.
Frequently asked questions
How do you tell fuel theft from normal consumption?
By what the engine was doing. A drop in level with the engine off cannot be explained by consumption, so it is flagged for checking as a possible drain (a leak or a sensor fault can give a similar reading). On the road, the loss from the tank is compared with the amount of fuel the injectors drew according to CAN bus data. If the loss is clearly larger, that is an irregularity.
Which is more accurate: a fuel probe or CAN bus data?
They measure different things. The probe gives the level of liquid in the tank, the CAN bus the fuel actually used by the engine. Only by comparing both sources can you tell whether the fuel was burnt in the engine or left the tank some other way.
Is fuel monitoring worth it for a small fleet?
The calculation depends on the value of a single incident, not on the number of vehicles. With a full tank worth around €3,000, one prevented theft covers the cost of equipping several tractor units. In small fleets, refuelling checks alone also pay back faster, because the difference between the invoice and the increase in the tank is easier to trace.
How much can fuel monitoring save?
Operational analyses point to 5–12% of total fuel costs, with several effects contributing to that figure at once: stopping theft, less idling and optimised routes. Loss control on its own accounts for part of that range.