If you realise before starting the engine, do not start it. Moving the wrong fuel through the system can turn an inconvenient drain into a more expensive repair.
Stay at the pump when safe
Tell the filling-station staff and arrange specialist help. Do not switch the ignition on simply to move the car unless you have been told it is safe for that vehicle.
If you have already driven
Stop somewhere safe as soon as you become aware of the mistake and seek advice. The correct response depends on the fuel and engine.
avoid trusting internet folklore
Modern fuel systems can be expensive. Advice that was harmless on an old car may be poor advice for a newer one.
Some breakdown policies offer misfuelling help and some do not. It is worth knowing before you need it rather than discovering the exclusion at the pump.
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