Wrong fuel in your Mercedes B150? Diesel in a Petrol Mercedes?

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Mercedes Fuel Drain


Filling Diesel in a Petrol Mercedes is a usual mistake to make. And its solution is based on an assortment of things. Assuming you would like to find out what you ought to do to sort it out then read on.
Let us discuss the most important variables to keep in mind whenever choosing whether to have a fuel drain:

  1. What level of Diesel did you put in the Mercedes, taking into consideration that the fuel capacity of your Mercedes B150 is normally around 54 litres?
    1. A small quantity of Diesel, less than 2.7 litres of Diesel in a Petrol B150 will usually not really be a major problem. Experience has demonstrated to us that quantities less than 2.7 litres (close to 5% of the fuel tank volume) is very often capable of being sufficiently diluted simply by completely topping the remainder of the tank with Petrol.
      It's pretty unusual to encounter a car having difficulties because of less than 5% incorrect fuel contamination. Remember that it is uncommon - not impossible to encounter. There are a few motor vehicles that don't stand any level of contamination whatsoever.
    2. Anywhere between 2.7 and 5.4 litres of Diesel in the Mercedes (from 5 to 10%) is a 50/50 scenario. Our practical experience has shown us that as many people get away with this as all those who break down. Any time you are figuring out whether or not to risk it and simply fill it up recognise that it is just like gambling your car on black - you've got a 50/50 chance of it being ok.
    3. Anything more than 5.4 litres of Diesel in a Petrol B150 really should immediately be drained out seeing that your probability of succeeding with that quantity of contamination is more than likely below one in 50 - really long odds.
  2. Put some Diesel in a Petrol Mercedes and drove it: Have you noted any kind of performance concerns since putting the bad fuel in the B150? In that case, get it removed no matter the quantity of Diesel or even the contamination percentage. Continually driving an automobile that is now starting to suffer from the consequences of wrong fuel contamination will probably just cause increasing amounts of damage affecting the fuel system components.
  3. Are you looking for reassurance?
    In that case get it emptied. Regardless of the contamination percentage, there is always some amount of risk connected to driving a Petrol engine on fuel contaminated with the incorrect fuel. Likely implications of driving on the wrong fuel include things like the motor refusing to start, running lumpy, lack of power, wearing of the high-pressure pump, worn or bunged injectors, and so forth. These are several of the most frequently seen Diesel in Petrol signs or symptoms, and should you recognise any of them stop driving and get it drained right now.

Stay away from getting any jack-of-all-trades to attend your vehicle. We are Mercedes specialists and have got the accreditation and practical experience required to make sure that you get back on the road with minimal hassle or trouble.

Put Diesel in a Petrol Mercedes

Unintentionally put Diesel in a Petrol Mercedes? Or possibly even put contaminated fuel in your Mercedes B150?

Give us a call for Help & Advice

Contact us and obtain reliable advice and sensible assistance for your precise circumstances

We come out and drain it

We can come to you to undertake the complete fuel removal & flush right there on scene

Once completed You Get Moving Once again

When we have completed you can get back moving and get on with your trip

Wrong Fuel Drain Specialists

We are the leading wrong fuel drain experts in the UK, offering national coverage, for Mercedes motorists especially. We primarily attend to:

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

We are Mercedes specialists and have successfully drained hundreds of Petrol Mercedes vehicles. Whether or not it is roadside, on a filling station forecourt, or even at your house, we are able to get you going again.

The Procedure

The technique of removing Diesel from a Petrol vehicle is in essence the same for the majority of vehicles. Obviously it can vary a bit as every manufacturer has their unique different fuel system. Nevertheless it still basically observes the below points:

Petrol in Diesel Mercedes

Fuel Drain

Empty the Fuel Tank

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Wrong Fuel Drain Mercedes

System Flush

Clean out the fuel lines & pumps

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Petrol in Diesel Drain Mercedes

Vehicle Restart

Get the car up and running again

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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.

Call us

In the event that you have any questions or want some help please Contact Us!
We are able to get you moving once again.

24/7 Mercedes Helpline

0333 366 0103

Our Corporate Office

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


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