Within hours, breakdown trucks and baffled mechanics were overwhelmed.
What looked like routine fuel stops at a small Swiss station quickly turned into a string of mysterious breakdowns, stalled engines and hefty repair bills. Only later did motorists learn that the pumps they trusted had been feeding their cars the wrong fuel entirely.
A quiet village, a normal fill-up… and then nothing
The story begins in Buriet, a village in the Swiss canton of St. Gallen, where a local filling station became the unlikely centre of a motoring drama. On a Friday in February, drivers stopped, paid, and left as usual. No warning lights. No strange noises. Nothing.
One motorist told Swiss media she filled up with petrol on her way home. The station was just around the corner, the drive was uneventful, and the car was parked up overnight. The shock came the next morning.
The next day, cars simply refused to start, as if their batteries had been pulled. In reality, their fuel systems were full of the wrong liquid.
Her vehicle would not fire at all. No coughing, no partial start, just a dead engine. She booked a tow truck, assuming some obscure mechanical fault. Only at the garage did the real cause surface: the tank, supposedly full of unleaded, contained diesel.
How a tank mix-up can cripple dozens of cars
As garages compared notes and drivers started calling the station, a pattern emerged. Multiple vehicles, all filled at the same location, all breaking down within hours. When one customer rang the station, she was greeted with a telling response: “Oh, you as well.”
The supplier later admitted an error during delivery. The underground tanks for petrol and diesel had been filled the wrong way round, meaning every pump was effectively lying about what it dispensed.
A single delivery mistake at one station turned each “full tank” into a slow-motion breakdown, spread across an entire village.
This type of mix-up has occurred before, including in France and Belgium, where drivers reported engines cutting out just a few hundred metres after leaving the forecourt. The Buriet incident is a reminder that when wholesale fuel logistics go wrong, the fallout doesn’t stay behind the station’s fences.
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What happens when petrol and diesel are swapped?
Diesel in a petrol engine: grim, but usually survivable
Putting diesel in a petrol vehicle rarely creates an instant explosion scenario, but it does confuse everything the engine expects. Petrol engines rely on a precise mist of highly flammable fuel. Diesel is thicker and burns differently.
- Poor combustion and misfires as diesel reaches the cylinders
- Clogged injectors and fuel lines due to heavier fuel
- Engine stalling or refusal to start once contamination builds
When the mistake is caught early and the car has not driven many kilometres, damage tends to be limited to the fuel system. For most drivers, the remedy includes:
- Draining and flushing the fuel tank
- Cleaning or replacing fuel lines and injectors
- Fitting new fuel filters
Repair bills in these situations generally fall in the range of a few hundred euros, often quoted between €350 and €900.
Petrol in a diesel engine: where the big bills start
The other direction is nastier. Diesel engines depend on the fuel not just for energy, but also for lubrication of precision components like the high-pressure pump. Petrol, by contrast, strips away that protective film.
Petrol in a diesel system acts like a solvent, eroding the fine layer of lubrication that keeps pumps and injectors alive.
That loss of lubrication can score or seize the injection pump and injectors. Once tiny metal particles circulate in the system, damage can spread quickly. Common repair operations include:
- Complete fuel system flush
- Replacement of the injection pump
- New injectors and filters
- In severe cases, replacement of the entire fuel system
Here, costs rise sharply. Garages often quote figures from around €900 up to €3,000, and in extreme cases even more if multiple components fail together.
Who picks up the bill when the station is at fault?
In Buriet, the fuel company’s representative publicly pledged that all damage would be covered. That promise typically involves commercial liability insurance, which pays for towing, diagnostic work, cleaning the fuel system, replacement parts, and reimbursing customers for the contaminated fuel they bought.
| Situation | Typical payer | What’s often covered |
|---|---|---|
| Wrong fuel due to station/supplier error | Station’s or supplier’s insurer | Repairs, towing, fuel reimbursement |
| Driver misfuels their own car | Driver or their insurer (if covered) | Draining, limited repairs, sometimes towing |
| Dispute over responsibility | May involve both insurers | Case-by-case, depends on evidence |
In previous European cases, dozens of owners have submitted claims at once. Insurers investigate delivery slips, tank logs and CCTV to confirm that the pumps really were dispensing the wrong product.
What drivers should do if they suspect bad fuel
When rumours start circulating about “swapped pumps” at a station you visited, fast action can limit damage and simplify compensation.
Stop driving at the first sign of engine trouble after a fill-up. Forcing the car to limp home can turn a minor clean-up into a major rebuild.
Key steps for drivers include:
- Do not try to restart the engine repeatedly if it stalls
- Arrange a tow instead of driving “just a bit further”
- Keep the receipt showing time, date and station address
- Contact the station and your insurer as soon as possible
- Ask the garage to document their fuel analysis and findings
Garages often keep samples of the drained fuel, which can be useful evidence. A written report linking the breakdown to contaminated fuel strengthens claims against the station’s insurer.
Why errors like this happen in the first place
Fuel stations usually rely on a routine system: separate underground tanks, colour-coded delivery hoses, detailed paperwork. Yet, as this case shows, human error still slips through.
Miscommunication between depot staff and tanker drivers, unclear labelling, or rushing a delivery in bad weather can all contribute. When two tanks sit side by side, swapping the hoses even once creates a silent problem: everything appears normal at the pump, but the wrong fuel flows underneath.
Some operators now add extra safeguards, such as unique connectors for petrol and diesel tanks or electronic checks that log which hose connected to which opening. These safeguards reduce risk but do not entirely erase it.
Understanding the jargon: misfuelling versus contaminated fuel
Two terms often get mixed up. They describe different situations, and the difference can affect who pays.
- Misfuelling usually refers to a driver putting the wrong fuel in their own car, such as petrol in a diesel vehicle by grabbing the wrong nozzle.
- Contaminated fuel typically means fuel supplied by the station does not match what is advertised or is mixed with water, dirt or the wrong product.
In the Buriet case, the problem sits squarely in the “contaminated fuel” category, even though drivers technically had the wrong fuel in their cars. They chose the correct pump; the supply chain behind that pump failed them.
Practical scenarios: when a small error changes your day
Imagine a commuter who refuels on Friday evening before a 300-kilometre trip on Saturday. If the station has swapped fuels, two very different scenarios can play out:
- They park the car overnight: the vehicle may not start in the morning, sparing the engine from running long with the wrong fuel but forcing a tow and lost travel plans.
- They set off immediately: the car might make it partway down the motorway before cutting out, leaving them stranded in a more dangerous and stressful setting, with potentially greater mechanical damage.
Another scenario involves car-sharing fleets or rental companies. A single faulty refuel by staff can take multiple vehicles off the road if they all fill up from the same batch, disrupting dozens of bookings and triggering a wave of claims.
For drivers, these cases are a reminder of how dependent modern mobility is on unseen logistics decisions. A few minutes at the pump rely on a chain of correct actions stretching from refinery to tanker to underground tank.