A driver filling a car with fuel at a petrol station, holding the nozzle in the fuel tank.

Put the wrong fuel in your car? What to do next

It’s easier than you might think to pick up the wrong pump. In fact, someone in the UK puts the wrong fuel in their vehicle every three minutes, according to the RAC. If you act quickly and safely, you can prevent significant damage to your car. 


Misfuelling can usually be resolved if you follow the right steps. 

What to do if you put the wrong fuel in your car 

First things first: do not start your engine. If you turn your engine on, it will circulate the wrong fuel and damage your vehicle’s fuel system. 

Here’s what you should do instead: 

  1. Get your car to a safe spot, if you can 

  1. Or tell a petrol station staff member, so they can put cones around your car 

Contact RAC breakdown support 

You’re covered for breakdowns on the Motability Scheme, as part of your all-inclusive package

The RAC will help get you moving again. They’ll safely drain and flush your car’s fuel system. 

How to report your breakdown: 

  • Use the myRAC app. It’s quick and easy 

  • Call 0800 73 111 73 

What to do if you’ve already driven away 

It’s natural to only realise you’ve made a mistake after you’ve already driven off. 

Here’s what to do: 

  1. Stop somewhere safe 

  1. Turn off your engine 

  1. Contact the RAC 

Listen and look for symptoms: if you hear unusual noises or notice a loss of power, these are signs the wrong fuel has already damaged your car.

What happens if you put the wrong fuel in your car 

This depends on which fuel you used: 

Petrol in your diesel car 

  • If you start your car, you’re removing the lubrication a diesel car needs 

  • Metal parts can grind together and damage the fuel system 

  • You’ll need major repairs or a new engine 

Diesel in your petrol car 

  • If you start your car, you’ll clog your spark plugs and fuel system 

  • Your tank will need to be drained 

  • Your whole fuel system will need a good clean 

Will it damage your vehicle? 

If you start your car 

It’s very likely the wrong fuel will cause severe damage as it circulates your car’s fuel system. You’ll need major repairs and possibly a new engine. 

If you do not start your car 

There’s usually no significant or permanent damage. The incorrect fuel stays in your fuel tank, which makes it much easier for an RAC mechanic to drain and flush your system. 

How to stop misfuelling 

Here are a few practical tips to save you from misfuelling in the future: 

  • Double check the pumps: get in the habit of looking them over twice, before you pick anything up 

  • Look at the label: once it’s in your hand, check it again. Does the fuel match the car you’re driving today? 

  • Write a reminder for yourself: stick this inside your fuel door or cap and you’ll see it every time you top up 

Some cars do the hard work for you: Certain vehicles clearly show which fuel you should use on their fuel door, like in the image below. This makes things easy when you’re unsure. 

Close-up of a diesel fuel cap on a yellow car, with the fuel filler flap open.

It’s a common mistake, so if it happens to you again, just remember: never start your engine, and contact the RAC. 

Want more useful car tips? 

Knowing more about your car can save you time and extra costs. 

From the Motability Scheme


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