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Thank you for your question. My name is ***** ***** I am a fully qualified technician with over 30 years experience. I will try and fully answer you question.
Even though the dangers of petrol being put into modern diesels are quite high, with the very small amount of petrol that your daughter has put into her tank, and as she has then filled up with diesel diluting the petrol even further I would have no worries that this would cause any problems.
As you say 12pence worth of fuel is less than 150ml and this will be diluted sufficiently as to not cause any problems. I would also ensure the next time the tank is filled it is again filled to the top, and then I would recommend a new fuel filter just to be extra sure.
But as said, that amount of fuel will not cause harm.
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