If you’ve put the wrong fuel in, you’re not alone. Putting petrol in a diesel car is especially easy, and mistakenly putting diesel into a petrol tank is also possible.
What matters most is what you do next.
Here’s what to do if you’ve put the wrong fuel in
1. Don’t try to start the car.
This is important – starting the car can cause permanent damage and mean costly repair work. Remove the keys from the ignition instead.
2. Get to a safe location
Put the car in neutral. If you’re still at the petrol station, get someone to help you push the car to a safe spot.
3. Call us 07513637663
Our Fuel Assist team are on-hand to come out to you. We’ll drain the wrong fuel and put in the right one. You’ll have enough of the correct fuel to get you going.
What happens if you put petrol in a diesel car?
Putting petrol into a diesel tank causes more damage than diesel in a petrol car. Plus, petrol nozzles can easily fit into most modern diesel filter necks. It makes it far easier to accidentally put petrol into a diesel tank than vice versa.
Petrol damages diesel engines because:
Diesel acts as a lubricant, helping the fuel pump to do its job. Petrol does the opposite – it increases friction between parts in the diesel engine. The friction isn’t good news for your diesel engine. The more petrol that’s pumped through the diesel engine, the more damage it’ll do. That’s why it’s so important not to start the car. Common rail (or HDi) diesel engines are particularly likely to be damaged by the wrong fuel. If there’s a lot of damage, it could mean new fuel pumps, injectors, pipes, filters, fuel tank – or even a whole new engine.
What happens if you put diesel in a petrol car?
The diesel pump nozzle is bigger than most petrol filler necks, so it doesn’t really fit. That makes it far less common to put the wrong fuel in a petrol car than putting petrol in a diesel car. Plus, it’s not as bad for a petrol engine to have diesel in it so there’s usually not as much damage.
Here’s what happens when you put diesel in a petrol car:
Petrol ignites by a spark from the spark plugs. Diesel in a petrol engine clogs up the spark plugs and fuel system. That means the car simply won’t start. It’s a real pain. But it’s not as bad as the damage that petrol can cause to a diesel engine. Your petrol engine shouldn’t have any permanent damage once the fuel’s drained out.