Misfuelled Your Rental Car? Here's What NZ Hire Companies Charge

Misfuelling happens to the best of us. Whether you've accidentally put petrol in a diesel rental or diesel in a petrol car at a Z Energy or BP station, the most important thing is knowing what to do next to minimise both damage and costs.

Most major New Zealand rental companies treat misfuelling as driver negligence, which means you'll likely face charges beyond your standard excess. Hertz, Avis, and Budget typically charge between $500-$1,500 for fuel contamination damage, plus workshop costs for fuel system cleaning. These charges often fall outside basic rental insurance coverage, meaning even comprehensive travel insurance may not cover the full cost.

The severity of charges depends on several factors: whether you started the engine (which circulates contaminated fuel through the system), how much wrong fuel was added, and which fuels were mixed. Petrol in a diesel engine is particularly costly because petrol acts as a solvent, potentially damaging fuel pumps, injectors, and filters. Diesel in petrol engines, while still serious, typically causes less extensive damage if caught early.

Rental excess insurance policies vary significantly. Some cover misfuelling under 'accidental damage' while others specifically exclude fuel contamination. Always check your policy wording, as standard excess reduction products from companies like Insurance4carhire or iCarhireinsurance may not include fuel-related incidents.

What to do right now:

First and most importantly: do not start the engine or turn the ignition. If you've already started it, turn it off immediately and don't restart it. Starting the engine circulates contaminated fuel throughout the system, turning a simple tank drain into expensive repairs.

Second, contact your rental company immediately to report the incident. They'll guide you through their specific process and may recommend approved recovery services.

Third, take photos of the fuel receipt and note which pump you used. This documentation helps determine the exact fuel mixture and potential damage scope.

Don't attempt to drive the vehicle or 'dilute' the problem by adding correct fuel. Even short distances can cause thousands of dollars in engine damage.

When you need professional misfuel recovery in New Zealand, EEK Mechanical operates 24/7 across the country. We'll dispatch a tow truck to collect your rental vehicle and transport it safely to a certified workshop for proper fuel system cleaning. Call us on 0800 769 000 for immediate assistance — we understand the urgency and will get your situation sorted quickly and professionally.