What to Do If You Put the Wrong Fuel in Your Car
- Misfuelled Car Fix
- Feb 25
- 3 min read
Updated: Mar 1
24/7 Hotline: 0800 999 1182
Putting the wrong fuel in your car is a mistake that can happen to anyone. Whether you accidentally filled a petrol car with diesel or vice versa, the consequences can be costly and stressful. Knowing what to do immediately after misfuelling can save your vehicle from serious damage and reduce repair costs. This guide explains the steps to take if you put the wrong fuel in your car and how to get professional help quickly.
Recognizing the Problem Early
The first sign of putting the wrong fuel in your car is often unusual engine behavior. You might notice:
The engine struggles to start or won’t start at all.
The car runs roughly or stalls soon after starting.
Warning lights appear on the dashboard.
Strange noises come from the engine.
If you realize the mistake while still at the petrol station, do not start the engine. Starting the engine circulates the wrong fuel through the system, increasing the risk of damage.
What to Do Immediately After Misfuelling
Do Not Start the Engine
If you catch the error before turning the key, keep the engine off. Starting the engine can push the wrong fuel into the fuel lines, injectors, and engine, making repairs more complicated and expensive.
Inform the Petrol Station Staff
Tell the staff at the petrol station about the mistake. They may have protocols or contacts for emergency assistance. Some stations can provide immediate help or advice on what to do next.
Call a Specialist Service
Contact a professional Misfuelled Car Fix service as soon as possible. For example, calling 0800 999 1182 connects you to experts who can guide you through the next steps and arrange for your car to be safely drained and cleaned.
How Professionals Fix a Misfuelled Car
Once you contact a specialist, they will typically follow these steps:
Drain the fuel tank completely to remove all the wrong fuel.
Flush the fuel system to clear any remaining contaminants.
Refill with the correct fuel and test the engine.
Check for any damage to fuel injectors or engine components.
This process requires special equipment and expertise, which is why professional help is essential.
Common Misfuelling Scenarios and Their Risks
Petrol in a Diesel Car
Diesel engines rely on fuel to lubricate the fuel pump and injectors. Petrol lacks this lubricating property and can cause severe damage, including:
Fuel pump failure
Injector damage
Engine overheating
If petrol is put into a diesel car, the engine may start but will soon run poorly or stop.
Diesel in a Petrol Car
Petrol engines ignite fuel with spark plugs, and diesel does not vaporize as easily. Diesel in a petrol engine can cause:
Engine misfires
Rough running or stalling
Clogged spark plugs
Diesel is thicker and can block fuel injectors, leading to costly repairs.
How to Avoid Putting the Wrong Fuel in Your Car
Preventing misfuelling is easier than fixing it. Here are some tips:
Check the fuel type before filling. Look for labels on the fuel cap or inside the fuel door.
Use different fuel nozzles. Diesel nozzles are usually larger and won’t fit petrol cars easily.
Stay focused at the pump. Avoid distractions like phones or conversations.
Ask for help if you are unsure about the fuel type.
Keep a reminder card in your car with the correct fuel type.
What to Expect After Repairs
After your car is drained and cleaned, the engine should run normally if no damage occurred. However, if the wrong fuel circulated for some time, you may face:
Reduced engine performance
Warning lights that need resetting
Further repairs if injectors or pumps were damaged
Always get a full inspection after misfuelling to ensure your car is safe to drive.
When to Call 0800 999 1182
If you suspect you have put the wrong fuel in your car, calling 0800 999 1182 connects you to a specialist Misfuelled Car Fix service. They provide:
Immediate advice on what to do next
Emergency draining and cleaning services
Vehicle recovery if needed
Fast, professional repairs to get you back on the road
Calling early can prevent costly damage and save time.