What to Do When You Put Diesel in a Petrol Car or Petrol in a Diesel

Accidentally filling your vehicle with the wrong fuel is a common mistake, but it’s important to stay calm and act quickly. The impact of misfueling varies depending on whether diesel is in a petrol car or petrol in a diesel vehicle. Understanding the differences can help you respond effectively and protect your vehicle.

When diesel is put into a petrol car, the risk of engine damage is generally lower, especially if the engine hasn't been started. Petrol engines rely on spark ignition, and diesel fuel doesn’t ignite in the same way. If you notice the mistake before starting the engine, do not turn on the ignition or attempt to start the vehicle. The best course of action is to have the vehicle recovered to a NZIFDA-certified workshop for manufacturer-spec fuel system recovery. Our team at EEK Mechanical can dispatch a tow truck 24/7, ensuring your vehicle is safely transported and professionally cleaned to prevent any damage.

In contrast, putting petrol into a diesel vehicle is far more dangerous. Diesel engines rely on compression ignition, and petrol can cause severe damage to the fuel system, including the pump and injectors. If petrol is added to a diesel vehicle, do not start the engine under any circumstances. Starting the engine circulates the petrol through the system, increasing the risk of costly repairs. Immediate recovery to a certified workshop is essential. Our technicians will perform manufacturer-spec fuel system recovery, removing the contaminated fuel and inspecting the system for potential damage.

What to do right now? First, do not start or turn on the engine. If you realise the mistake before starting, keep the vehicle stationary and call EEK Mechanical at 0800 769 000. We will dispatch a tow truck promptly, and our certified workshop will handle the fuel system recovery professionally. If the engine has already been started, avoid revving or driving the vehicle. Contact us immediately for expert assistance.

Remember, attempting roadside fixes or draining fuel yourself can cause further damage and may void warranties. Always rely on NZIFDA-certified professionals for manufacturer-spec fuel system recovery. Our service includes a full assessment, safe removal of contaminated fuel, and proper cleaning to ensure your vehicle’s longevity.

Misfueling is a stressful experience, but with the right response, you can minimise damage and costs. EEK Mechanical is here to help 24/7. Call us at 0800 769 000 for immediate assistance, and we will dispatch a tow truck to recover your vehicle and take it to a trusted, certified workshop for expert recovery.