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7 Ways to Avoid Putting the Wrong Fuel in Your Car

Simple, practical habits to stop misfuelling before it happens — from pump colour codes and misfuel caps to rental car risks.

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Riley
Chief Marketing Officer · 8 October 2026
<p>Putting the wrong fuel in your car is easier to do than most drivers realise, and it can happen to anyone on a busy day. The good news is that almost every misfuel is preventable with a few simple habits. Here are seven practical ways to keep the right fuel in the right tank.</p><p>First, learn the pump colour codes. In New Zealand, diesel nozzles are typically black and petrol nozzles are green, but colours can vary between brands. Never rely on colour alone — always read the label on the pump and the fuel flap before you lift the nozzle.</p><p>Second, check the fuel flap and filler cap every single time. Most vehicles have a clear label inside the flap stating the correct fuel. Make it a habit to glance at it before you start filling, even if you have owned the car for years.</p><p>Third, fit a misfuel prevention cap or device. These inexpensive inserts physically stop a petrol nozzle from entering a diesel filler neck, and vice versa. They are a simple, one-time safeguard that works even when you are tired or distracted.</p><p>Fourth, slow down at the pump. Rushing is one of the biggest causes of misfuelling. Take a breath, confirm the fuel type, and only then begin filling. A few extra seconds can save you a significant repair bill.</p><p>Fifth, avoid distractions. Put your phone away, finish conversations before you start, and do not fill up while juggling children or work calls. A focused moment at the pump is your best defence.</p><p>Sixth, be extra careful in unfamiliar or rental vehicles. Rental cars are a common source of confusion because the fuel type may differ from your own car. Check the rental agreement, the fuel flap label, and the key tag before you fill. If you are unsure, ask the rental company — many offer third-party roadside assistance for exactly this situation.</p><p>Seventh, never start the engine if you suspect a misfuel. This is the single most important rule. Starting the engine circulates the wrong fuel through the system and can cause substantial damage to pumps and injectors. Leave the vehicle off and seek help.</p><p>What to do right now: if you have already put the wrong fuel in, do not start the engine. Move the vehicle to a safe spot if you can do so without starting it, and call us. EEK Mechanical dispatches a tow truck to your location — whether that is a forecourt, roadside, home or car park — and collects your vehicle. It is transported to a NZIFDA-certified workshop, where manufacturer-spec fuel system recovery is completed by trained technicians. Recovery never happens at the collection location; the workshop is where the proper equipment lives.</p><p>Costs vary by tow distance, after-hours timing and vehicle, and every recovery is fully itemised. You can review our <a href="/rate-card">rate card</a> for transparent, itemised pricing, and our <a href="/terms">terms of service</a> for full details.</p><p>If you have misfuelled, call <a href="tel:8667773712">(866) 777-3712</a> and we will dispatch a tow truck 24/7 to collect your vehicle and get it to a certified workshop for manufacturer-spec fuel system recovery.</p>

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