Bad fuel in your Smart Fortwo? Diesel in a Petrol Smart?

We can help!
Call us: 0333 366 0103
Smart Fuel Drain


Putting Diesel in a Petrol Smart is a usual error. And what you should do about it hinges on several factors. In the event that you would like to find out what you need to do about it then read on.
Here are the most crucial factors to to consider when choosing whether to get it drained:

  1. What level of Diesel have you put into the Smart, taking into consideration that the fuel tank capacity of the Smart Fortwo is probably around 33 litres?
    1. Hardly any Diesel, as little as 1.65 litres of Diesel in a Petrol Fortwo will normally not be a massive problem. Experience has shown us that quantities less than 1.65 litres (which is almost 5% of the overall fuel tank volume) is often capable of being sufficiently diluted through totally filling the rest of the tank with Petrol.
      It's relatively uncommon to come across a car suffering from difficulties with under 5% incorrect fuel contamination. Bear in mind that it is uncommon - definitely not impossible to encounter. You will discover some automobiles that won't stand any degree of fuel contamination whatsoever.
    2. Anywhere between 1.65 and 3.3 litres of Diesel in the Smart (from 5 to 10%) is really a 50/50 situation. Our experience has shown us that as many motorists get away with this as those people who don't. Whenever you are deciding on whether to chance it and basically fill it up bear in mind that it is exactly like wagering it all on black - you have a 50/50 chance of it working.
    3. Anything more than 3.3 litres of Diesel in a Petrol Fortwo ought to as soon as possible be drained out seeing that your probability of getting away with that amount of contamination is more than likely lower than one in 50 - extremely long odds.
  2. Put Diesel in a Petrol Smart and drove it: Have you noted any kind of performance concerns since putting the wrong fuel in the Fortwo? If you have, get it drained irrespective of the quantity of Diesel or even the contamination ratio. Continually driving a motor vehicle that is beginning to suffer the effect of fuel contamination will probably just bring about even more harm being caused to the fuel system components.
  3. Do you want assurance?
    Then get it emptied. No matter the contamination percentage, there is invariably some degree of danger resulting from driving a Petrol vehicle on fuel contaminated with the wrong fuel. Possible final outcomes of driving on the incorrect fuel normally include the motor not starting, running unevenly, loss of power, wearing of the high-pressure pump, worn or bunged injectors, etc. These are a few of the most frequently seen Diesel in Petrol signs and symptoms, and if you observe any of them stop driving and get it removed asap.

Don't just get any general so-and-so to try to drain your automobile. We are Smart experts and possess the accreditation and expertise required to make certain that you are back on the road with little hassle or trouble.

Put Diesel in a Petrol Smart

Accidentally put Diesel in a Petrol Smart? Or possibly even put contaminated fuel in your Smart Fortwo?

Contact us for Help & Advice

Give us a call and obtain genuine advice and sensible assistance for your exact circumstance

We come out and do a fuel drain

We are able to go to you to perform the full fuel drain & clean there on scene

Once performed You Get Going Once again

As soon as we are done you are able to get back on the road and get on with your day

Wrong Fuel Drain Specialists

We are the top rated wrong fuel drain authorities in the UK, boasting national coverage, for Smart motorists especially. We typically fix:

  • Unleaded petrol in Diesel Car
  • Diesel in an Unleaded Petrol Car
  • AdBlue contamination
  • Water contamination

We are Smart specialists and have successfully drained hundreds of Petrol Smart vehicles. Whether or not it's roadside, on a filling station forecourt, or even at your home, we are able to get you on the road again.

The Process

The technique of extracting Diesel from a Petrol vehicle is generally similar for the vast majority of cars. Of course it may vary to some degree as each manufacturer has their unique different fuel system. However it still generally follows the below points:

Petrol in Diesel Smart

Fuel Drain

Empty the Fuel Tank

View more
Wrong Fuel Drain Smart

System Flush

Clean out the fuel lines & pumps

View more
Petrol in Diesel Drain Smart

Vehicle Restart

Get the car up and running again

View more


Hours a Day


Days a Week





Our Partners

Just some of the few people we work with to bring you the best petrol in diesel service possible

Diesel in Petrol FAQs

When someone has put Diesel in a Petrol car they have a few very common questions. So we have compiled a list of the most Frequently Asked Questions for you

I put Diesel in a Petrol car and drove it. What do I do?


Turn off the car as soon as possible and call us. Continuing to run a vehicle on the wrong fuel can potentially damage it. We will be able to give you advice and assistance based on your circumstances

Will driving a Petrol car on Diesel cause damage to it?


It can. However, if the problem is caught and remedied quickly the risks will be minimal. Of the 1,500 vehicles we attend every month, less than 0.5% have suffered and substantial damage requiring parts replacement.

How much Diesel can I get away with in a Petrol car?


The safe answer is none. However you might be able to get away with a very low contamination ratio. That being said, we always highly recommend draining anything over a 5% contamination ratio asap.

I know about petrol in diesel, but what about Super Unleaded?


Putting Super Unleaded, or Shell V-Power, BP Ultimate Unleaded, etc, will have the exact same effect as putting regular unleaded petrol in your diesel car and will need to be drained out and flushed.

Will getting you to do a fuel drain void my warranty?


No! The EU Block Exemption Regulations clearly state that "the work can be carried out by as long as that garage uses manufacturer approved parts and correctly follows the manufacturer's service schedule."

Can I top it up with Petrol and add some 2-stroke oil?


This might work on some vehicles in some cases, but in the majority on instances it won't and you risk damaging the Lambda sensors as well as fuel pump and injectors, just as a regular misfuel.

Get in Touch

If you have any concerns or need our help please Call us!
We can get you on the road once again.

24/7 Smart Helpline

0333 366 0103

Our Corporate Office

Fuel Fixer Ltd, Linx House, 147 London Road, East Grinstead, RH19 1ET

Important Info

Fully Insured

VAT Registered

APEX Certified


Fully Mobile

Professionally Trained