Misfuel
Put the Wrong Fuel in Your Car? Here's What to Do
Putting the wrong fuel in is more common than most people think, especially with fuel caps and pump handles that look similar, or when you're distracted or filling up in a rush. The single most important thing is what you do in the next few minutes, because that decides whether it's a simple fix or an expensive one.
If you haven't started the engine, or you've only just noticed after switching it on, the damage can usually be limited. We recover misfuelled vehicles across Birmingham, the Black Country, Solihull and Sandwell without starting the engine, so the wrong fuel never gets pumped through the system.
The golden rule: don't start the engine
If you realise before starting the car, leave it exactly where it is and call for help rather than trying to move it under its own power, even a few feet. Starting the engine draws the wrong fuel through the fuel lines, injectors and pump, turning a tank-only problem into a much more expensive repair.
If you've already driven a short distance
If the engine was running and you've driven any distance before noticing, don't restart it once it's stopped or once you've pulled over. The longer it runs on the wrong fuel, the more of the system gets contaminated, particularly on diesel engines where petrol can damage the high-pressure pump quickly.
Petrol in a diesel vs diesel in a petrol
Diesel engines are generally more sensitive to contamination — a small amount of petrol can seriously damage the injection system if it's run through it. Petrol engines are usually more forgiving of a small amount of diesel, but it's still not something to risk driving on. Either way, the safest move is the same: don't start it, and get it recovered.
- Don't start or restart the engine once you realise
- Put the handbrake on and stay safe if you're on a forecourt
- Note roughly how much wrong fuel went in, if you can
- We'll recover the car flat, without running the engine
What happens after recovery
Once we've recovered your car, it typically needs the tank drained and flushed by a specialist before it's safe to run again. We can take the car to a garage or fuel drain specialist of your choice, or suggest options if you're not sure who to use locally.
Questions we get asked
Can I just add the correct fuel on top to dilute it?
No, this doesn't reliably fix the problem and can still cause damage. It's much safer to have the tank drained properly rather than trying to dilute your way out of it.
I've only put a small amount of the wrong fuel in — is it still a problem?
Even a small amount can cause issues, particularly petrol in a diesel engine. It's worth having it checked rather than assuming it'll be fine.
Will you drain the tank at the roadside?
We recover the vehicle without starting it; tank draining is usually done by a specialist or garage rather than at the roadside itself.
What if I'm on a petrol station forecourt?
Stay calm, put the handbrake on, don't start the engine, and let the forecourt staff know while you wait for us — most fuel stations deal with this fairly regularly.
Misfuelled and not sure what to do?
Don't turn the key. Call 07402 666 687 and we'll recover your car safely, engine off, anywhere in Birmingham or the Black Country.