Returning a Rental Car After a Misfuel: Documentation Tips to Protect Yourself

Act Fast When You Realise the Wrong Fuel Went In

Misfuelling a rental car is more common than most drivers expect, and the steps you take in the first hour matter enormously. Whether you have filled a petrol car with diesel or put 91 octane into a diesel vehicle, stop driving immediately. Do not start the engine if you have not already. The sooner you cease operation, the better the outcome for the fuel system and your potential liability.

Your first call should be to the rental company to report the incident. Ask for their preferred recovery provider or whether their roadside assistance partner covers misfuel events. Many rental agreements include access to third-party roadside assistance programmes, though these vary in what they cover. Keep a record of who you spoke with, the time, and what you were told.

How EEK Handles Rental Vehicle Recovery

EEK Mechanical operates a tow-to-workshop recovery model for all New Zealand road vehicles, including rental cars. When you contact our customer hotline on 0800 769 000, we dispatch a tow truck to your location—whether that is a forecourt, roadside, car park, or accommodation. The vehicle is transported to a NZIFDA-certified workshop where manufacturer-spec fuel system recovery is completed. This work happens only at the workshop, never at the collection location.

The tow truck operator handles loading and safety at the scene. Recovery equipment and the technical fuel system work are located at the workshop. This structured approach ensures the vehicle receives proper assessment and documented repair according to manufacturer standards—critical evidence when dealing with rental companies and insurers.

Document Everything Before You Return the Keys

Rental companies will assess the vehicle upon return and may pursue the hire excess if damage is attributed to the misfuel incident. Protect yourself by gathering thorough documentation. Request copies of the tow docket, workshop assessment, and itemised recovery invoice. These should show the vehicle was professionally recovered and that fuel system work was performed to manufacturer specifications at a certified facility.

Photograph the fuel cap area, dashboard warnings, and any visible symptoms before the tow truck arrives. Note the odometer reading and whether the engine was started after misfuelling. If you purchased rental excess insurance through a third-party provider, notify them promptly—delays can complicate claims. The insurer claims line for policy queries is 09 885 2000.

Recovery costs are fully itemised. Line items include tow, labour, disposal, replacement fuel, any required parts, a booking fee, and an NZIFDA filing fee. The booking deposit is $849.00. For full pricing details, see our rate card. Component repairs—such as pump or injector replacement after driving on wrong fuel—are separate from the recovery invoice.

Communicate Proactively with All Parties

Share your documentation with both the rental company and your excess insurer as soon as recovery is complete. Ask the rental company for written confirmation of what they intend to charge against your bond or credit card hold. If their assessment differs from the workshop findings, you have independent technical evidence to reference.

Keep all correspondence in writing where possible. Email trails create a clear record of who was informed and when. If the rental company directs you to their preferred roadside assistance provider, obtain a reference number and confirm whether that provider covers the full recovery or only initial collection.

Need Help Now?

If you have just misfuelled a rental vehicle, call EEK Mechanical on 0800 769 000 for 24/7 assistance. We will arrange tow-to-workshop recovery and provide the documentation you need for rental and insurance purposes. For pricing information, refer to our rate card. You can also access your booking details through the customer portal.