Diesel in a Petrol Car

This is much less common because the standard diesel nozzle at fuel stations is larger than the fuel filler neck on modern petrol cars.

However, people put diesel in jerry cans and sometimes don’t label them or mislabel them, making this a more plausible mix-up.

If you know that you have accidentally put the wrong fuel in the car, then don’t compound the mistake and potential for engine failure by driving the vehicle while trying to think about what to do. Instead, call us for our expert advice immediately.

We recommend a full drain on any amount of contamination. We strongly recommend you call us first for out expert advise – were here to help. A simple phone call could save you thousands in unnecessary repair bills.

DO NOT START YOUR ENGINE or put your key in the ignition as this can prime the electric pump in the tank and circulate the contaminated Petrol.

It is essential to carry out a full drain. Once the contaminated fuel has been removed and the tank filled with the correct fuel there should be no damage to the engine.

Already driven car before realising?

If you have already started your vehicle, STOP driving as soon as it is safe to do so.

With this situation, it is recommended to take every precaution to remove all of the contaminated Petrol. A full tank drain, and complete fuel system flush is essential to stop or minimise any potential damage from to your vehicle’s fuel system.

If the vehicle has broken down as the result of being driven on Diesel instead of Petrol, once the system has been completely flushed through with the correct fuel and the tank has been filled with petrol, the spark plugs will need to be cleaned to remove any carbon deposits.

In many cases petrol vehicles will log cylinder misfire faults on the engine management system. Our mechanics are provided with the latest scan tools and software to clear and review any fault codes and to check your engine is running as normal following our repairs.

Reduce the risk

Always double check the fuel grade indicator on the pump before filling.

The risk of mis-fueling is higher if:

  • You use an unfamiliar filling station – don’t assume hose colours are the same as your ‘local’ site
  • You switch between brands using different hose/nozzle colours
  • You swap cars (using different fuel) at home or work – it’s easy to ‘forget’ which car you’re filling
  • You hire a car using different fuel to your normal car
  • You buy a new car using different fuel to your old car
  • You continue a conversation with passengers while filling
  • You are in a hurry/running late