What Happens If You Put Diesel in a Petrol Car? How to Fix It

Accidentally put diesel in a petrol car? Learn the immediate steps to avoid engine damage and how to safely resolve the issue.

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If you accidentally put diesel in a petrol car, it can cause significant damage to the engine and fuel system. Immediate steps should include not starting the car to avoid circulating the diesel. It's crucial to drain the fuel tank and flush the system with the correct petrol fuel. This often requires professional services from a mechanic or a breakdown service to safely rectify the mistake and prevent long-term damage to the vehicle.

FAQs & Answers

  1. Can a petrol car run on diesel fuel? A petrol car cannot run properly on diesel fuel. Diesel is thicker and does not ignite correctly in a petrol engine, which can cause severe engine damage.
  2. What should I do if I put diesel in my petrol car by mistake? Do not start the car. Immediately drain the fuel tank and flush the fuel system professionally to remove diesel and prevent damage.
  3. Will putting diesel in a petrol car cause permanent damage? If the car is started, diesel fuel can cause significant damage to the engine and fuel system. Prompt flushing and repair can often prevent permanent damage.
  4. How much does it cost to fix diesel in a petrol car? Costs vary depending on the extent of contamination and damage, but professional draining and flushing typically range from moderate to high expenses depending on service location.

Watch More

For more helpful tips on car care and avoiding common vehicle mistakes, check out our guides on how to recognize fuel mix-ups early and steps to take when your car won’t start.

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