What Happens If You Put Diesel in a Petrol Car? Risks and Solutions

Learn what happens if diesel is mistakenly filled in a petrol car and the best steps to take to avoid engine damage and costly repairs.

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Filling a petrol car with diesel can cause significant damage to the engine. Diesel in a petrol engine doesn’t ignite properly, resulting in a lack of combustion. This can lead to the engine misfiring, stalling, or not starting at all. If this happens, do not start the car. Instead, have it towed to a mechanic where the fuel system can be drained and cleaned. Starting the car could circulate the diesel and cause more damage, potentially leading to costly repairs.

FAQs & Answers

  1. Can I start my car if I accidentally put diesel in a petrol engine? No, you should not start the car if diesel has been filled into a petrol engine. Starting it can circulate the diesel fuel, causing more extensive damage to the engine. Instead, have the car towed to a mechanic.
  2. What damage does diesel cause in a petrol car engine? Diesel fuel does not ignite properly in petrol engines, leading to misfires, stalling, or failure to start, which can damage the fuel system and engine components.
  3. How can I fix my car after putting diesel in a petrol engine? The mechanic will need to drain and clean the fuel system, including the fuel tank, lines, and injectors, to remove all diesel fuel and prevent further damage.

Watch More

For more helpful automotive tips, check out our videos on how to properly maintain your engine and avoid common fueling mistakes. Also, explore guides on what to do if you accidentally put petrol in a diesel car and routine car servicing essentials.

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