Accidentally Put Diesel in a Petrol Car By Mistake and Drove It?
Putting the wrong fuel in your vehicle is a more common mistake than many drivers realise. Each year in the UK, thousands of motorists accidentally put diesel into petrol cars or petrol into diesel vehicles. Although it may seem like a small error, it can lead to serious damage if not dealt with promptly.
At Wrong Fuel Specialists, we help drivers nationwide understand the risks of misfuelling and provide fast, reliable solutions when it happens. Modern diesel engines, in particular, are very sensitive to fuel quality, and adding petrol to a diesel system can quickly cause problems.
The good news is that if the mistake is identified early, potential damage can often be significantly reduced with prompt professional assistance.
Why Does Misfuelling Happen?
With modern petrol and diesel fuel caps looking increasingly similar, and many drivers regularly switching between different vehicles, it has become surprisingly easy to misfuel—whether that means putting diesel in a petrol car or petrol in a diesel vehicle. In a busy moment, distraction or driving an unfamiliar hire car can quickly lead to the wrong fuel being added.
In most cases, diesel nozzles are slightly larger, which makes it difficult to insert them into a petrol vehicle. However, the opposite mistake—putting a petrol nozzle into a diesel tank—is much easier to make, which is why these incidents are so common.
If this happens, a professional fuel drain service is required to safely remove the contaminated fuel and flush the system, helping restore your vehicle and get you back on the road as quickly as possible.
What Happens When You Put Diesel in a Petrol Tank?
Petrol engines are not designed to run on diesel fuel. Petrol is highly volatile and ignites using a spark from the spark plugs, while diesel is heavier and relies on compression for ignition. When diesel enters a petrol engine, it can lead to a range of serious issues:
- Increased Repair Costs: If the engine is started and diesel circulates through the system, it can cause internal contamination and significantly higher repair expenses.
- Poor Combustion: Diesel does not evaporate like petrol, so it fails to burn properly in a petrol engine, resulting in inefficient performance.
- Engine Misfiring: The vehicle may struggle to start, run roughly, or show signs of irregular engine behaviour.
- Fuel System Blockage: Diesel’s oily nature can clog petrol injectors and spark plugs, potentially leading to damage in components such as the catalytic converter.
Prevention Tips
If you realise that diesel has been put into a petrol tank, the most important step is to avoid starting the engine. Turning the ignition on can circulate the diesel through the fuel system, significantly worsening the issue and increasing repair costs.
Instead, follow these steps:
- Stop immediately: If you’re still at the fuel station, do not start the vehicle.
- Inform the station staff: They may assist in safely moving your car if needed.
- Contact Wrong Fuel Specialists: Our mobile fuel drain experts operate across the UK and can usually reach you within an hour, wherever you are.
We’ll come to your location, safely remove the contaminated fuel, and help get you back on the road as quickly as possible.
What wrong fuel specialists Does
At Wrong Fuel Specialists, we focus on professional wrong fuel rescue services and have assisted over 100,000 motorists across the UK. If you’ve accidentally put diesel in a petrol tank, our trained technicians will take care of the situation from start to finish:
- Safely drain the contaminated fuel from your vehicle
- Flush the fuel system to remove any remaining residue
- Refill the tank with the correct fuel
- Carry out final checks to ensure your vehicle is safe and ready to drive
We provide a fast and cost-effective alternative to dealership repairs or towing services. Our fully equipped mobile service vans can reach you wherever you are—whether you’re at a petrol station, roadside, or at home—helping you get back on the road without unnecessary delay.
Why Speed Matters
The longer diesel remains in a petrol tank, the higher the risk of damage to the vehicle. If the engine is started, the diesel can circulate through sensitive components such as fuel injectors, spark plugs, and the catalytic converter, leading to more serious and costly issues.
These parts are often expensive to repair or replace, and fixing them can take time. Contacting Wrong Fuel Specialists as soon as possible helps reduce both the risk of damage and the overall repair costs
Why Choose wrong fuel specialists?
With rapid response times, nationwide coverage, and competitive pricing, Wrong Fuel Specialists is one of the UK’s most trusted misfuel recovery services. Our experienced team understands how stressful it can be to put diesel in a petrol tank, and we are dedicated to getting you back on the road quickly and safely.
Whether you’re in London, Manchester, Glasgow, or a remote rural area, help is always within reach. Our 24/7 service ensures that professional assistance is available whenever you need it—day or night.