Bad fuel in your Hyundai i40? Diesel in your Petrol Hyundai?

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


Filling up with Diesel in a Petrol Hyundai is a well-known mistake. And its remedy is based on various factors. In case you would like to find out what it is best to do to sort it out then continue reading.
Listed here the most important factors to take into account whenever deciding on whether or not to have a fuel drain:

  1. How much Diesel have you put in to the Hyundai, bearing in mind that the fuel capacity of your Hyundai i40 is probably around 70 litres?
    1. A tiny amount of Diesel, something like 3.5 litres of Diesel in a Petrol i40 will in most situations not really be a big problem. Experience has shown us that anything less than 3.5 litres (5% of the overall fuel tank) is frequently able to be completely diluted simply by entirely topping the tank with Petrol.
      It's pretty rare to come across a vehicle going through problems due to under 5% incorrect fuel contamination. Remember that it is very infrequent - certainly not impossible to encounter. There are a number of cars that will not endure any quantity of contamination in the slightest.
    2. Between 3.5 and 7 litres of Diesel in the Hyundai (from 5 to 10%) is more of a 50/50 situation. Our expertise has shown that as many people get away with it as all those who don't. When figuring out whether or not to chance it and just top it up bear in mind that it is the same thing as wagering all of it on black - you've got a 50/50 chance of it working out.
    3. Anything more than 7 litres of Diesel in a Petrol i40 must as soon as possible be drained out seeing as your probability of driving with this level of contamination is very likely below one in 50 - extremely huge odds.
  2. Put Diesel in a Petrol Hyundai and drove it: Have you observed any performance issues after putting the incorrect fuel in the i40? In that case, get it removed irrespective of the amount of Diesel or even the contamination percentage. Still driving a car that is now beginning to suffer from the consequences of wrong fuel contamination can just be responsible for more and more harm affecting the fuel system parts.
  3. Are you looking for security?
    In that case get it drained. Regardless of contamination ratio, there is inevitably some amount of threat resulting from driving a Petrol motor on Petrol contaminated with the incorrect fuel. Probable outcomes of driving a vehicle on the incorrect fuel normally include the motor refusing to start, running unevenly, losing power, wearing of the high-pressure pump, worn or clogged injectors, and the like. These are several of the most common Diesel in Petrol symptoms, and in the event that you observe any of them then stop and have it removed right away.

Do not simply have any unqualified mechanic to attend your automobile. We are Hyundai experts and have the credentials and expertise required to make certain that you are back on the road with little hassle or trouble.

Put Diesel in a Petrol Hyundai

Inadvertently put Diesel in a Petrol Hyundai? Or possibly even put contaminated fuel in your Hyundai i40?

Give us a call for Help & Guidance

Give us a call and receive straightforward guidance and sensible help for your exact circumstance

We show up and drain it

We would go to you to carry out the fuel drain & flush right there on scene

All done & You Get Moving Once again

As soon as we have completed you are able to get back on your way and get on with your day

Wrong Fuel Drain Specialists

We are the top rated wrong fuel drain authorities in the UK, offering nationwide service, for Hyundai motorists especially. We principally attend:

  • Unleaded petrol in Diesel Auto
  • Diesel in Unleaded Petrol Auto
  • AdBlue contamination
  • Water contamination

We are Hyundai specialists and have successfully drained hundreds of Petrol Hyundai vehicles. Whether or not it's roadside, on a petrol station forecourt, or even at your house, we can get you moving again.

The Procedure

The system of removing Diesel from a Petrol car is essentially the same for the majority of vehicle makes. Of course it may vary a bit as each make has their particular fuel system. Even so it still essentially adheres to the following points:

Petrol in Diesel Hyundai

Fuel Drain

Empty the Fuel Tank

View more
Wrong Fuel Drain Hyundai

System Flush

Clean out the fuel lines & pumps

View more
Petrol in Diesel Drain Hyundai

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.

Contact Us

If you have any concerns or require help please Contact Us!
We can get you on the road once again.

24/7 Hyundai 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