Accidentally putting 20 litres of petrol in a diesel car is a mistake many people make, especially when distracted or in a hurry. While mixing petrol with diesel can be damaging, the key is acting quickly and correctly to avoid severe engine problems. In this article, we will explore what happens when petrol and diesel mix, how to manage this situation, and steps you can take to fix it effectively. Following these steps can save you from expensive repairs and help protect your car’s performance and longevity.
Why Mixing Petrol in a Diesel Car is Problematic
Diesel engines operate differently from petrol engines, relying on compression rather than spark ignition. Diesel fuel has lubricating properties that petrol lacks, which is crucial for the performance of a diesel engine’s components, especially the fuel pump and injectors. Adding petrol compromises the lubrication within a diesel engine, leading to potential engine wear and tear.
When a large amount, such as 20 litres of petrol in a diesel car, is introduced, it poses significant risks:
- Fuel Pump and Injector Damage: Without the necessary lubrication, these components wear down rapidly.
- Reduced Combustion Efficiency: Petrol is more volatile than diesel, leading to inefficient combustion.
- Carbon Deposits: Petrol doesn’t burn as cleanly in diesel engines, resulting in deposits that clog the engine over time.
Understanding these risks is vital when trying to resolve the issue quickly and safely.
Signs You’ve Put Petrol in a Diesel Car
If you have driven with 20 litres of petrol in a diesel car, your vehicle will likely show noticeable symptoms. Here’s what to look out for:
- Engine Misfiring: Misfiring or ‘coughing’ noises from the engine are common signs.
- Loss of Power: The engine may struggle or even stop, especially at low speeds.
- Unusual Exhaust Smoke: White or grey smoke from the exhaust could indicate a fuel mix issue.
- Difficulties Starting: Starting may take longer, or the engine may not start at all.
What to Do Immediately After Adding Petrol in a Diesel Car
Step 1: Do Not Start the Car
Starting the engine allows petrol to circulate through the system, causing further contamination and damage. If you realize the mistake before starting, keep the car turned off.
Step 2: Move the Vehicle to a Safe Location
If you’ve already driven a short distance, stop the car as soon as it is safe to do so. Keep the ignition off to prevent the fuel from moving further through the system.
Step 3: Contact a Professional
Misfueling assistance is available in the UK, with companies specializing in safely draining mixed fuel. Calling a professional service ensures that the job is done correctly, reducing the risk of further damage.
Draining the Fuel: Your Best Solution
For a substantial amount like 20 litres of petrol in a diesel car, a full drain of the fuel tank is necessary. Here’s what you should know about the process:
How Draining Works
- Fuel Removal: Professionals use specialized equipment to drain the fuel from your vehicle safely and efficiently.
- System Cleaning: After draining, flushing the fuel lines and injectors is recommended to eliminate any remaining petrol residue.
- Refilling with Diesel: Refill the tank with the correct diesel fuel before restarting the car to resume normal operation.
DIY Fuel Drainage: Should You Try It?
Draining fuel yourself is not advised unless you have the right tools and experience. Handling flammable substances requires care, and professional services have the equipment to ensure the fuel is disposed of safely.
Potential Damage and Repair Costs
If 20 litres of petrol in a diesel car remains untreated, you may face costly repairs:
- Fuel Pump and Injector Replacement: The lack of lubrication can wear down these parts, costing up to £1,500 or more in repairs.
- Engine Rebuild: In severe cases, extensive repairs could involve a complete engine rebuild, which could run up to £5,000 or higher.
- Catalytic Converter Issues: Petrol can damage the catalytic converter, requiring replacement if affected.
Acting quickly can help avoid these expensive repairs. Professional assistance may seem costly, but it is a small price to pay compared to the potential damage.
Frequently Asked Questions
1. Can I still drive if I’ve put 20 litres of petrol in my diesel car?
No, driving with petrol in a diesel car can cause extensive damage to the fuel system. Stop the car as soon as possible to avoid further contamination.
2. Is insurance likely to cover the cost of draining petrol from my diesel car?
Insurance policies vary, so it’s best to check with your provider. Some policies may cover misfuelling, while others may not.
3. Can I dilute the petrol by adding more diesel to the tank?
Diluting petrol with diesel is not advisable, as it does not fully eliminate the risk of damage. Draining the contaminated fuel is the safest solution.
4. How long does a fuel drain take?
A fuel drain typically takes between 30 minutes to an hour, depending on the amount of petrol and the specific vehicle.
Conclusion
Putting 20 litres of petrol in a diesel car is an unfortunate mistake but can be managed effectively with prompt action. Avoiding ignition, seeking professional help, and preventing future incidents are the best steps you can take. Remember, it’s critical to address the issue immediately to avoid costly repairs and long-term damage to your diesel vehicle.
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