Filling your petrol in diesel car mistake that many drivers make. While it may seem like a simple error, the consequences for your vehicle’s engine can be serious and expensive. Fortunately, taking the correct actions quickly can help prevent significant damage and costly repairs. Understanding the risks and solutions associated with this situation is key to preserving your car’s performance and your wallet.

Why Petrol in a Diesel Engine is Problematic

Diesel engines function very differently from petrol engines. Diesel fuel serves as both a lubricant and an energy source for the engine. On the other hand, petrol lacks the lubricating properties of diesel and ignites under entirely different conditions. When petrol enters a diesel engine, it dilutes the lubricating qualities of the diesel fuel and can cause severe damage to the delicate components of the fuel injection system and engine. Without proper lubrication, excessive wear and even catastrophic engine failure can occur.

Studies have reported thousands of cases of fuel misfuelling every year, and the average repair costs for this mistake can range into the thousands. The good news is that these incidents are avoidable if you act quickly and take the right steps.

The Immediate Effects of Misfuelling

The moment petrol enters a diesel engine, it begins to disrupt its functioning. Typical effects include:

  • Damage to the fuel pump due to a lack of lubrication
  • Clogging of injectors by petrol residue
  • Overheating of components, which could lead to further wear and tear

The effects can worsen significantly if the engine is started or the car is driven. Even a short drive can cause the petrol to circulate through the engine, leading to more extensive damage.

Steps to Avoid Costly Repairs After Misfuelling

1. Recognize the Mistake Immediately

The sooner you realize the error, the better the chances of preventing damage. If you notice the mistake while still at the pump, do not turn on your engine. Inform the fuel station staff and keep your vehicle stationary.

2. Avoid Starting the Engine

Starting the engine is one of the worst actions you can take in this situation. It will begin circulating the petrol through the diesel system, greatly increasing the potential for damage to the fuel pump, injectors, and other critical parts of the engine.

3. Call for Professional Assistance

Contact a professional fuel drainage service or mechanic as soon as possible. They will have the equipment and expertise to safely remove the contaminated fuel from your car. This preventative action is much less expensive than repairing damaged fuel systems or engines.

4. Flush the System

Even after the contaminated fuel has been drained, a technician may recommend flushing the fuel system to ensure that no traces of petrol remain. Doing this will help preserve the functionality of your engine and prevent future complications.

5. Use High-Quality Diesel Afterward

Once the fuel system is cleaned, refill your tank with high-quality diesel. Adding a diesel additive can also boost lubrication and help minimize any long-term effects of the misfuelling incident.

Benefits of Acting Quickly

Acting swiftly after a petrol-in-diesel mistake will pay off in numerous ways:

  • Preventing Extensive Damage

By keeping petrol from circulating through the engine, you protect critical components like the fuel pump and injectors.

  • Saving on Costs

Prompt action can significantly reduce the need for major repairs, which often result in bills that reach into the thousands.