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What To Do If You Put the Wrong Fuel in Your Car
Updated on Tuesday 3rd March 2026
Putting the wrong fuel in your vehicle is a common mistake and happens to drivers of all experience levels. Acting quickly and correctly can prevent serious engine damage and unnecessary costs.
Clearflo Fuel Recovery provides a 24 hour mobile fuel drain and fuel system cleaning service across Wales, helping drivers get back on the road safely and efficiently.
Immediate Steps If You’ve Used the Wrong Fuel
If you realise you have put petrol in a diesel vehicle or diesel in a petrol vehicle, follow these steps:
1. Do not start the engine
Starting the engine allows contaminated fuel to circulate through the fuel system. This can damage fuel pumps, injectors and common rail components, especially on modern vehicles.
2. If the engine is already running, stop safely
Pull over as soon as it is safe to do so and switch the engine off. The less the vehicle runs, the lower the risk of damage.
3. Contact a specialist fuel drain service
A professional mobile fuel drain service can remove the contaminated fuel safely without the need for vehicle recovery or garage delays.
4. Do not attempt to dilute the fuel
Adding the correct fuel does not solve the problem and can increase the risk of fuel system damage.
What Happens If You Drive on the Wrong Fuel
Using the wrong fuel can affect vehicles in different ways depending on engine type:
Petrol in a Diesel Engine
Petrol acts as a solvent in diesel engines, reducing lubrication within the fuel pump. This can cause metal-to-metal contact, wear and the release of metal particles. These particles may then travel through the fuel system, potentially damaging injectors, the common rail and the high-pressure fuel pump.
Modern diesel engines, including HDI and common rail systems, are particularly sensitive to contamination.
Diesel in a Petrol Engine
Diesel fuel does not ignite properly in petrol engines and can cause poor combustion, misfiring and stalling. While usually less damaging than petrol in a diesel engine, it still requires professional removal to avoid further issues.
How Clearflo Fuel Recovery Resolves the Problem
Clearflo Fuel Recovery specialises in mobile fuel drainage and fuel system cleaning. Our process is designed to minimise risk and get your vehicle running safely again:
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Drain all contaminated fuel from the tank
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Flush the fuel system to remove residue and debris
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Clean fuel lines, fuel pump and affected components
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Refill with the correct fuel
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Prime the system and restart the vehicle
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Test and check the vehicle before leaving you to continue your journey
Where required, we can also carry out advanced engine and fuel system cleaning treatments.
Coverage Area
Clearflo Fuel Recovery operates a 24 hour mobile service across Wales, including: Cardiff, Newport, Bridgend, Abercarn, Abergavenny, Abertridwr, Bargoed, Barry, Bedwas, Blaenavon, Caerphilly, Caldicot, Chepstow, Cwmbran, Ebbw Vale, Hengoed, Llantrisant, Magor, Maesteg, Merthyr Tydfil, Mountain Ash, Nelson, New Tredegar, Ogmore Vale, Penarth, Pentre, Pontyclun, Pontypool, Pontypridd, Port Talbot, Porth, Rhondda, Risca, Treharris, Tredegar, Treorchy, Tonypandy, Ystra d Mynach, and surrounding areas
Trusted Specialists With Proven Experience
With over 20 years of experience, Clearflo Fuel Recovery is a trusted specialist in wrong fuel recovery and fuel system cleaning.
We are:
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Fully insured
Our technicians are trained to deal with petrol and diesel contamination safely, professionally and efficiently.
Trusted by Drivers Across Wales
Drivers across Wales rely on Clearflo Fuel Recovery for fast response times, professional service and clear communication during stressful situations.
I accidentally put petrol in my diesel car this evening. It was dark and cold and I was really panicking but called Clearflo, and they responded quickly. A friendly technician arrived promptly and sorted everything out for me. The service was amazing! They even followed me back to the petrol station to help me top up my diesel. I couldn't be more grateful for their support during such a stressful situation. I highly recommend their service!
Sam Snell
I broke down in a supermarket car park during my lunch break. I spent around half an hour calling around loads of different companies and garages but Clearflo was the cheapest, so it was a no brainer. Stuart came quickly and even picked me up from my office to drive me to my car, saving me getting a taxi. Really top guy.
Ruth Jones
We put the wrong fuel in our van today and ClearFlo provided a great service. We were just at the start of a long journey and time was of the essence, ClearFlo were easy to contact, quick to arrive and help us.
Excellent service, friendly and at a good price.
Thank you.
Simone Jayne Devinett
Came to my aid Tuesday 29th after I put petrol in my diesel car and drove approx 1/2 mile..(Automatically felt like kicking myself). Found their service on Google, called, explained the situation and booked a time. They contacted me when about 15 minutes away. There was no rush to finish the job quickly and made sure the car was running fine before leaving.. I drove to a petrol station and topped up (tripple checked I put diesel in).. Car has been running fine since. Would highly recommend their service and take this opportunity to thank them again.. B Thomas Hyundai i30 2013..DIESEL..
Badyn Thomas
5 star Top bloke Stuart, offered initial advice over the phone, after putting Unleaded into our Diesel Car.
Made an appointment, messaged 20mins before arrival.
Swift action and refilled with Diesel.
Saved the day Stuart!
Thank you
Ashley 'Chedz' Chedzoy
24 Hour Assistance When You Need It
If you have put the wrong fuel in your vehicle and require assistance, Clearflo Fuel Recovery operates 24 hours a day, 7 days a week across Wales.
Our mobile service allows us to attend your location and resolve the issue without unnecessary recovery or garage delays.
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