Didn't realise I put petrol in my diesel car until it started stuttering. Is it badly damaged?

I've just put petrol into my diesel car. I didn't realise and drove it for about three mins. I only realised when it started stuttering. The car would have had about 15 miles of diesel left in the tank before putting £20 worth of unleaded in. What are the chances that my car is now damaged?

Asked on 26 May 2020 by Scott Smith

Answered by Dan Powell
Impossible to say without seeing the car in the metal. However, given the reported stuttering, I'd be very concerned that the petrol has caused friction and then damage within the fuel lines, pump(s) and/or injectors. The car will need to be inspected by a mechanic and the fuel systems drained and flushed. At best, it'll be a couple of hundred pounds. At worst, a few thousand. Do not drive it, under any circumstances.
Tags: misfuelling
Similar questions
Last night I accidentally put 7.5 litres of petrol into my diesel car. It was late at night and everything was closed because of the coronavirus. I filled the rest of the car with diesel and drove home...
Will my diesel-engined car be okay with a small amount of petrol in a full tank of diesel?
If an insurance policy has specific misfuelling cover, would claiming to have the tank drained be counted as a claim or be treated like a replacement windscreen and not count as a claim?
 

Ask Honest John

Value my car