Bad fuel in your BMW 640d? Petrol in a Diesel BMW?

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BMW Fuel Drain


Filling up with Petrol in a Diesel BMW is a common mistake. And its remedy depends upon a number of things. In the event that you want to know what you have to do to fix it then keep on reading.
Listed below are the most crucial factors to to consider when deciding whether or not to have a fuel drain:

  1. Exactly how much Petrol did you put in the BMW, taking into account that the fuel capacity of the BMW 640d is usually approximately 70 litres?
    1. A tiny quantity of Petrol, less than 3.5 litres of Petrol in a Diesel 640d will in most cases not necessarily be a significant problem. Experience has demonstrated to us that an amount less than 3.5 litres (which is 5% of the total fuel tank volume) is quite often able to be sufficiently diluted by thoroughly filling the tank with the appropriate fuel.
      It's pretty uncommon to encounter an automobile going through difficulties with under 5% wrong fuel contamination. Remember that it is very infrequent - certainly not impossible to encounter. There are actually certain cars that won't endure any amount of fuel contamination at all.
    2. In between 3.5 and 7 litres of Petrol in the BMW (from 5 to 10%) is a 50/50 scenario. Our working experience demonstrates that as many people get away with it as those people who break down. When you are deciding on whether or not to chance it and just top it up consider that it is very much like betting it all on black - you will have a 50/50 chance of it working.
    3. Anything above 7 litres of Petrol in your Diesel 640d really should as soon as possible be drained out as your probability of getting away with this amount of contamination is very likely lower than one in 50 - definitely huge odds.
  2. Put some Petrol in a Diesel BMW and drove it: Have you detected any performance problems since putting the bad fuel in the 640d? If so, get it removed no matter the volume of Petrol or the contamination percentage. Continually running a car that is already beginning to suffer from the consequences of wrong fuel contamination will probably definitely be responsible for progressively more harm affecting the fuel system components.
  3. Are you looking for assurance?
    Simply get it emptied. Whatever the contamination ratio, there is inevitably some degree of threat linked with operating a Diesel engine on Diesel contaminated with Petrol. Probable consequences of driving a vehicle on the incorrect fuel can include the motor not starting, running lumpy, reduced power, wearing of the high-pressure pump, worn or clogged injectors, etc. These are several of the most common Petrol in Diesel signs or symptoms, and if you recognise any of them cease driving and have it drained immediately.

Don't just have any jack-of-all-trades to attend your vehicle. We are BMW experts and have got the credentials and working experience necessary to make certain that you get back on the road with no hassle or trouble.

Put Petrol in a Diesel BMW

By mistake put Petrol in a Diesel BMW? Or even put contaminated fuel in your BMW 640d?

Give us a call for Assistance & Guidance

Contact us and obtain genuine advice and practical assistance for your exact circumstance

We arrive and do a fuel drain

We are able to go to you to perform the complete fuel removal & purge there on scene

All done & You Get Going Once again

Once we are done you should be able to get back on your way and get on with your day

Wrong Fuel Drain Specialists

We are the leading wrong fuel drain specialists in the UK, having nationwide coverage, for BMW motorists in particular. We primarily attend to:

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

We are BMW specialists and have successfully drained thousands of Diesel BMW vehicles. Whether it is roadside, on a filling station forecourt, or even at home, we can get you on the road once again.

The Process

The procedure of removing Petrol from a Diesel vehicle is essentially the same for the majority of vehicle makes. Of course it does vary somewhat as each manufacturer has their own distinct fuel system. Even so it still basically follows the below principles:

Petrol in Diesel BMW

Fuel Drain

Empty the Fuel Tank

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Wrong Fuel Drain BMW

System Flush

Clean out the fuel lines & pumps

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Petrol in Diesel Drain BMW

Vehicle Restart

Get the car up and running again

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Petrol in Diesel Questions

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

I put Petrol in a Diesel 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 Diesel car on Petrol 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 Petrol can I get away with in a Diesel 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 Diesel 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 concerns or want some help please Contact Us!
We can get you moving once again.

24/7 BMW Helpline

0333 366 0103

Our Corporate Office

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

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