6 Symptoms of Misfuelling Your Diesel Car with Petrol

Today’s diesel engines are incredibly complex compared to what they were just a decade or so ago. Thanks to technological advances, they are now more economical, quieter, and generate fewer emissions. Unfortunately, this also means that it can be more difficult to troubleshoot issues when something isn’t quite right.

An engine that isn’t working optimally, such as experiencing hesitations or not running as smoothly as it should, could be the result of a variety of issues. From clogged air filters to faulty exhaust sensors or even inadequate fuel pressure, there are many potential causes. However, one factor that is often overlooked is the quality of the fuel.

In the UK, fuel contamination is one of the top three reasons why a diesel vehicle may break down while on the road. That’s why you need to know the signs of misfuelling your car to get the fix needed as soon as possible before things get out of hand.

That said, let’s talk about those signs:

  1. Engine Misfires

Misfiring occurs when the fuel and air mixture in the engine is not properly balanced. If your car has petrol in the diesel tank, it can cause the engine to misfire, resulting in a rough ride and reduced engine performance.

  1. Poor Fuel Economy

If your car uses petrol instead of diesel, it won’t be able to combust the fuel properly, resulting in poor fuel economy. You’ll be forced to fill up more often than normal, and you could spend much more than you usually would.

  1. Unusual Exhaust Smoke

If your car runs on petrol, it will produce heavier exhaust smoke than normal. This smoke usually has a yellow or white colour, and it’s a sure sign that something is wrong with your engine.

  1. Acceleration Issues

Petrol engines are designed to run at much higher speeds than diesel engines. If your car is running on petrol, you may notice that it has difficulty accelerating and that it doesn’t reach its normal top speed.

  1. Excessively High Engine Temperature

If your car runs on petrol, it won’t be able to combust the fuel properly, resulting in an excessively high engine temperature. This can cause serious damage to your engine, and it’s important to get it fixed as soon as possible.

  1. Fuel Leaks

If there is petrol in your diesel tank, it can easily leak out of the tank and into the engine. Not only is this dangerous, as there’s a potential for a fire, but it can also damage other aspects of your engine and other car parts.


All in all, if you’re experiencing any of these symptoms, it’s important to take your car to a mechanic as soon as possible. A qualified mechanic can diagnose the problem and get your car running properly again. Don’t let a mistake with fuel lead to costly repairs—take care of it now and save yourself time and money in the long run!

Petrol in Diesel UK is a leader in fuel-draining services offering service units all over the UK. If you are looking for auto draining services, contact us right away.