Putting the wrong fuel in your car happens more often than you’d expect. Maybe you’re tired, distracted, or just not used to the vehicle. That mistake feels alarming, but what you do in those first five minutes really matters.
Your response right after misfuelling decides if you’ll just need a simple drain or face a major repair bill.
Call Us NowIf you act fast, you can keep contaminated fuel from spreading through your engine. Here’s a minute-by-minute breakdown to get you through those first crucial moments.
Let’s get into when to stop, what to jot down, who to call, and which common reactions actually make things worse. The steps are simple, but following them in order gives your car the best shot at avoiding serious damage.
Minute 1: Stop immediately and do not start the engine
Stop as soon as you notice the mistake and stop fuelling. And don’t even turn the key or give the engine a start.
Starting the engine pushes fuel through the car’s system. That damages the car a lot and costs you a lot.
Minute 2: Hazard lights on, turn off ignition, remove key and exit vehicle to a safe location
Use your hazard lights so you can warn the other drivers. The button can be on the dashboard or on the centre console.
Turn off the ignition and remove the key. The key being removed prevents the fuel from entering the engine further.
Get out of the car slowly so you stay safe. Move out of the range of the traffic and don’t take the risk of staying by the fuel pumps.
Minute 3: Record pump details: station name, pump number, fuel type and time
(For Illustrative Purposes Only)
Write down the station’s name and exact spot. Note the pump number you used.
Record which fuel you accidentally put in. Check the time and jot it down. Snap a photo of the pump display if you can.
These details help mechanics and your insurer figure out what happened.
Minute 4: Call us immediately (why NOT to call your insurer first)
Reach out to Simple Fuel Solutions now; don’t call your insurer yet.
Call Us ImmediatelyWe’re Scotland’s only independent PAS43-certified wrong fuel specialists, and we usually get to you in about 35-40 minutes.
Callouts from £129
Insurance companies slow things down with paperwork and questions. Every minute counts when wrong fuel is sitting in your tank.
Minute 5: Do not attempt to drive; have the tank professionally drained by our certified drainers
Call our professional fuel doctor right away. Please don’t try to fix this yourself or drive the car.
Speak To Our ProfessionalsOur certified technicians come to you and drain the contaminated fuel on site. The whole process usually takes about 20 minutes.
Understanding How Misfuelling Affects Your Vehicle
Wrong fuel can damage your engine in different ways depending on whether you put petrol in a diesel or diesel in a petrol tank. Mostly, these 2 scenarios happen. The amount added and whether you started the engine both matter a lot.
Immediate Mechanical Risks
Putting petrol in a diesel car is by far the most terrible thing to do. So diesel is good for lubricating the fuel pump and injectors, whereas petrol strips that layer of protection. When you start the engine, there is metal grinding into metal without any lubrication.
The fuel pump does seize fast. This is how injectors could fail due to petrol washing away the diesel film. You will probably hear a tapping, see the smoke and feel vibrations from the misfire.
Diesel on its own plays havoc with a petrol engine. Diesel is thicker than petrol spark plugs, so the engine may not fire and will run very rough, dump billowing smoke, and have low power.
Common warning signs include:
- Engine misfiring or stalling
- Knocking or grinding noises
- Excessive exhaust smoke
- Difficulty starting or no start
- Dashboard warning lights
Potential Long-Term Damage
Repairs get costly when you run your engine with the wrong fuel. For example, a fuel pump replacement commonly costs £400–600. Injectors cost between £150 and £300 each.
If contaminated fuel sets in the engine, you risk damaging pistons, cylinders and the catalytic converter. That can mean repairs costing more than £3,000. It goes from bad to worse as the engine gets old.
High-pressure systems of diesel engines of the new generation are especially susceptible. Despite that benefit, their tighter tolerances also make them more susceptible to petrol contamination.
What NOT to do (don’t accept a tow without draining first)
The biggest mistake you can make is starting your engine after filling your tank with the wrong fuel. Once you jump-start your engine, you send the contaminated fuel throughout your entire fuel system.
Do not start driving the car in hopes of making it home or to a garage. A short drive in a car that has the wrong fuel can damage your fuel pump, your fuel injectors, and your engine as well. Once the fuel system has been unclogged and fuel starts to circulate, you can expect the costs to begin to rise.
Here’s what to avoid:
- Starting the engine or turning the key
- Driving to a garage instead of draining on-site
- Accepting a tow before draining the tank
- Pushing or rolling your car with the engine running
If you tow your car to a garage with contaminated fuel still inside, you’ll pay for the tow and still need a drain. The fuel settles in the system during transport, making things worse.
Our PAS43-certified wrong fuel recovery specialists come to you. They drain the tank at the petrol station and add enough correct fuel to get you back on the road. It’s faster and easier than towing.
Frequently Asked Questions
What should I do immediately after putting the wrong fuel in my vehicle?
Stop filling, don’t start the engine, and write down pump details. Move to safety and call certified technicians first.
Should I start the engine if I have misfuelled, and what are the risks?
No, starting the engine spreads contaminated fuel and can cause major damage fast.
How can the wrong fuel be drained safely, and who should carry out the work?
PAS43-certified technicians should drain your tank on-site using proper equipment.
What symptoms suggest fuel contamination or bad fuel, and what should I do next?
Look for misfiring, smoke, warning lights, or loss of power. Stop driving and call a fuel recovery specialist.
