Misfuelling a Rental Car in NZ: Hire Charges, Excess & Next Steps

Misfuelling a rental car in New Zealand is stressful, but it is also a known, manageable problem. Whether you have added petrol to a diesel vehicle or diesel to a petrol vehicle at a Z Energy, BP, Gull or Mobil station, the actions you take before the engine is started make the biggest difference.

In New Zealand, hire companies generally classify misfuelling as damage caused by the hirer rather than as a mechanical fault. This matters because the standard excess on the rental agreement often does not simply cap what you will pay. Many agreements treat wrong fuel as a separate liability category, meaning the rental company may hold you responsible for the full cost of recovering the vehicle, repairing or replacing contaminated components such as filters, injectors or a high-pressure pump, and loss-of-use while the car is off the fleet. Some hire companies also apply an administration or recovery fee. The final amount varies with vehicle make, tow distance, after-hours timing and how far the wrong fuel travelled, so it is wise to obtain itemised documentation and not assume the standard excess will apply. Third-party roadside assistance through the rental company, AA, FMG or your insurer may help arrange a tow, but the repair responsibility usually still sits with the hirer under the rental contract.

Petrol in a diesel engine can reduce lubrication and damage high-pressure fuel components. Diesel in a petrol engine can foul spark plugs, sensors and the catalytic converter. In both cases, starting the engine or even cycling the ignition can pump the wrong fuel further through the system, changing a straightforward workshop recovery into a much more serious repair. That is why the number one rule is: do not start the engine.

What to do right now. First, do not start the engine and do not press the start button. Leave the vehicle where it is if it is safe to do so, and put it in neutral only if you need to push it clear of the pumps. Then contact the rental company with your agreement number and note the time, location and fuel taken. Next, call EEK on <a href="tel:0800769000" class="text-eek-orange no-underline hover:underline">0800 769 000</a>. We dispatch a tow truck to your location 24/7, whether you are at the forecourt, roadside, home or a car park. Our team will collect your vehicle and transport it to a NZIFDA-certified workshop, where manufacturer-spec fuel system recovery is completed. The collection scene is about safe loading and towing only; fuel system recovery happens only at the workshop, never at the roadside.

If you have put the wrong fuel in a rental car, call <a href="tel:0800769000" class="text-eek-orange no-underline hover:underline">0800 769 000</a>. We dispatch a tow truck 24/7, collect your vehicle, and transport it to a NZIFDA-certified workshop for manufacturer-spec fuel system recovery. Pricing is fully itemised — see the <a href="/rate-card" class="text-eek-orange no-underline hover:underline">rate card</a> for details, and our <a href="/terms" class="text-eek-orange no-underline hover:underline">terms of service</a> for how recovery works. Do not start the engine; call first.