Wrong fuel in your Smart Forfour Brabus? Diesel in a Petrol Smart?

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


Putting Diesel in a Petrol Smart is a well-known mistake to make. And its solution hinges on various things. If you want to find out what it is best to do about it then keep on reading.
Listed here are the main variables to keep in mind when figuring out whether or not to get a fuel drain:

  1. What level of Diesel did you put in to the Smart, bearing in mind that the fuel capacity of the Smart Forfour Brabus is most likely approximately 47 litres?
    1. A small quantity of Diesel, something like 2.35 litres of Diesel in a Petrol Forfour Brabus will usually not be a major problem. Experience has taught us that anything less than 2.35 litres (close to 5% of the overall fuel tank volume) is oftentimes able to be adequately diluted by thoroughly topping the remainder of the tank with Petrol.
      It's very unusual to come across an automobile going through issues due to lower than 5% incorrect fuel contamination. Do not forget that it is rare - certainly not impossible to find. There are some automobiles that don't endure any amount of contamination whatsoever.
    2. Somewhere between 2.35 and 4.7 litres of Diesel in the Smart (from 5 to 10%) is more of a 50/50 scenario. Our expertise has demonstrated that as many motorists get away with it as those people who don't. Any time you're deciding whether or not to chance it and simply top it up recognise that it is just like wagering it all on black - you will have a 50/50 chance of it being ok.
    3. Anything in excess of 4.7 litres of Diesel in a Petrol Forfour Brabus should really immediately be drained because your probability of driving with this quantity of contamination is probably below one in 50 - seriously long odds.
  2. Put some Diesel in a Petrol Smart and drove it: Have you observed any performance difficulties ever since putting the incorrect fuel in the Forfour Brabus? In that case, get it emptied no matter the quantity of Diesel or the contamination percentage. Proceeding to drive driving a car that is now starting to suffer the effects of wrong fuel contamination will typically result in more and more harm affecting your fuel system parts.
  3. Do you want peace of mind?
    In that case get it drained. Regardless of contamination percentage, there is always some degree of threat in connection with driving a Petrol vehicle on fuel contaminated with Diesel. Possible results of driving on the incorrect fuel normally include the motor refusing to start, running unevenly, losing power, wearing of the high-pressure pump, worn out or bunged injectors, and so on. These are some of the commonest Diesel in Petrol signs and symptoms, and should you notice any of them cease driving and have it removed as soon as possible.

Stay away from getting any unqualified mechanic to attend your automobile. We are Smart experts and have the credentials and knowledge necessary to make certain you are back on the road with no hassle or worry.

Put Diesel in a Petrol Smart

Unintentionally put Diesel in a Petrol Smart? Or even put contaminated fuel in your Smart Forfour Brabus?

Give us a call for Assistance & Advice

Call us and obtain straightforward guidance and practical assistance for your precise circumstances

We come out and do a fuel drain

We would reach you to undertake the fuel drain & cleanse there on scene

All done & You Get Moving Once again

Once we have finished you can get back on your way and get on with your trip

Wrong Fuel Drain Specialists

We are the top rated wrong fuel drain specialists in the UK, boasting national service, for Smart motorists especially. We primarily fix:

  • Unleaded petrol in your Diesel Vehicle
  • Diesel in your Unleaded Petrol Auto
  • AdBlue fuel contamination
  • Water fuel contamination

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

The Process

The method of extracting Diesel from a Petrol vehicle is generally exactly the same for virtually all cars. As you can imagine it can vary a bit as each brand has their unique fuel system. Even so it still observes 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 Questions

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

In the event that you have any queries or require help please Contact Us!
We are able to get you on the road once again.

24/7 Smart Helpline

0333 366 0103

Our Business Office

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

Weekdays: 9am to 5pm

Important Info

Fully Insured

VAT Registered

APEX Certified


Fully Mobile

Professionally Trained