Putting petrol in a diesel car is every driver’s worst nightmare, but making this mistake doesn't have to ruin your engine. If you catch it early and deal with the situation properly, you can save thousands of pounds in repair bills.

Here is what happens when you misfuel, along with the immediate steps you should take to stay safe and protect your vehicle.

Why Petrol in a Diesel Engine Causes So Much Damage

Diesel isn't just fuel; it also acts as a crucial lubricant for the fuel pump and injection system. Petrol works in the opposite way, it acts as a harsh solvent.

When petrol enters a diesel tank, it strips away the protective oil film. This causes metal parts to grind directly against each other, generating friction and fine metal shavings inside the engine. Turning the ignition key triggers a chain reaction: the pump draws petrol through the lines, destroying the high-pressure fuel pump and damaging the injectors.

If you leave the engine turned off, the petrol stays isolated inside the fuel tank. This means a technician can drain and flush the system quickly, safely, and at a fraction of the cost.

What to Do If You've Misfuelled

If you realise you put the wrong fuel in your car, follow these steps immediately to keep damage to a minimum:

1. Do not turn the key or press the start button: Don't even switch on the ignition to check the display, as this can prime the electric fuel pump and push petrol straight into the engine lines.
2. Stay where you are: If you are still on the petrol station forecourt, leave the car where it is and let the staff know. They deal with misfuelling all the time and can help you push the car to a safe parking bay if needed.
3. Pull over safely if you are already driving: If you notice the mistake while on the road, pull into a safe spot right away, switch off the engine, and turn on your hazard lights.
4. Avoid trying to drain the tank yourself: Siphoning fuel safely requires specialized extraction equipment to handle toxic fumes and dispose of contaminated fuel without creating a fire hazard.
5. Contact a professional fuel recovery team: Call a dedicated mobile fuel drain service to resolve the issue on the spot.

Fast, 24/7 Wrong Fuel Recovery

At Dr Fuel, we specialise in rapid, nationwide wrong fuel extraction. Whether you are stuck at the pump or stranded on the roadside, our team of qualified recovery technicians is available 24 hours a day, 7 days a week.

Our mobile units come equipped to drain contaminated fuel, flush out the system, and get you back on the road with minimal fuss.

Put petrol in your diesel car? Stay calm and call Dr Fuel now for fast nationwide support.