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uk Transport & mobility emergencies wrong fuel in car • misfuelled at petrol station • petrol in diesel car • diesel in petrol car • wrong fuel not started • not started engine yet • wrong fuel in tank • misfueling mistake • filled up wrong pump • wrong nozzle used • put wrong fuel in vehicle • fuel mix up at forecourt • accidentally misfuelled • wrong fuel in van • wrong fuel in rental car • petrol station fuel error • keyless start wrong fuel • wrong fuel and panic

What to do if…
you accidentally put the wrong fuel in your vehicle and have not started the engine

Short answer

Keep the engine off and don’t turn the ignition on—then arrange professional recovery/fuel draining before the car is started or driven.

Do not do these things

  • Don’t start the engine or turn the ignition on “just to move it”.
  • Don’t keep trying “a little bit of the right fuel” to dilute it and drive away.
  • Don’t attempt to siphon/drain the tank yourself on a forecourt (fire risk and spills).
  • Don’t let a friend tow it in a way that might be unsuitable for your vehicle (if unsure, request a flatbed recovery).
  • Don’t ignore it because the car seems normal right now—avoid any action that could make the fuel circulate.

What to do now

  1. Commit to “no ignition”. Put the key/fob well away from the driver’s seat (out of reach). Avoid pressing unlock/start buttons. (On some vehicles, even “ignition on” can prime the fuel system.)
  2. Tell the petrol station staff immediately. Say you’ve misfuelled and the engine has not been started. Ask where they want the vehicle positioned so it’s safe and not blocking pumps.
  3. Move the vehicle only without starting it (if needed and safe). If you must clear a pump, put it in neutral and, with help, push it to a safe bay/quiet spot on the forecourt.
  4. Call your breakdown provider (or your insurer’s breakdown line). Ask specifically for wrong-fuel assistance (tank drain and, if needed, a flush). Tell them the fuel type added, approximate amount, your vehicle details, and that it has not been started.
  5. Keep basic evidence for admin. Keep the receipt (or note the pump number, time, and location). This can help if you need to claim via breakdown/insurance or you’re dealing with a fleet/rental policy.
  6. If it’s a lease/company/rental vehicle, follow that process now. Call the fleet/lease/rental contact before authorising work if your agreement requires it.

What can wait

  • You do not need to decide today whether to make an insurance claim—first prevent the engine from being started and get recovery arranged.
  • You do not need to research costs or argue with the station—document the basics and focus on safe recovery.
  • You do not need to diagnose anything—if the engine hasn’t been started, the priority is keeping it off until a professional drains the tank.

Important reassurance

This is a common mistake, and noticing it before starting the engine is the best-case timing. Keeping the ignition off usually prevents it turning into major damage.

Scope note

These are first steps only to stabilise the situation and avoid avoidable damage. The recovery technician/garage will advise what drain/flush steps are appropriate for your specific vehicle.

Important note

This is general information, not vehicle-specific mechanical advice. Always follow your vehicle handbook and the instructions from your breakdown provider/garage, especially for recovery/towing methods.

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