7 Ways to Avoid Putting Wrong Fuel in Your Car

Misfuelling is more common than you'd think. At EEK Mechanical, we help dozens of New Zealand drivers every month who've accidentally put the wrong fuel in their car. Whether it's petrol in a diesel engine or diesel in a petrol car, it's an easy mistake that can happen to anyone.

Here are seven practical ways to avoid this costly error:

First, rely on pump colour codes at major fuel stations. Most Z Energy, BP, and Mobil stations use green handles for petrol and black handles for diesel. However, don't depend entirely on colours as they can vary between brands – always read the labels too.

Second, consider a misfuel prevention cap. These aftermarket devices only allow the correct nozzle size to fit your fuel tank, physically preventing wrong fuel from entering.

Third, develop a pre-fuelling habit. Before grabbing any nozzle, take five seconds to remind yourself what fuel your car needs. Say it out loud: "This is my diesel car, I need diesel."

Fourth, be extra cautious with rental cars. Always check the fuel type before leaving the rental office and place a reminder note on your dashboard. Rental misfuels are incredibly common because you're driving an unfamiliar vehicle.

Fifth, pay attention at the pump. Diesel nozzles are typically larger than petrol nozzles, and diesel feels different when dispensing – it's often slower and has a distinct smell.

Sixth, stay focused while fuelling. Put your phone away and avoid distractions. Many misfuels happen when drivers are rushing or multitasking.

Seventh, double-check fuel door labels. Most modern cars have fuel type stickers inside the fuel door – read them every time until it becomes second nature.

What to do right now:

If you've already misfuelled, don't panic and absolutely do not start your engine. This is crucial – starting the engine circulates contaminated fuel through your system, turning a simple drain into an expensive repair. Step away from the vehicle immediately.

Next, check if your insurance covers misfuelling. Many New Zealand insurers include this under their comprehensive policies, which can save you significant money on repairs.

If you've put the wrong fuel in your car, call EEK Mechanical on 0800 769 000 immediately. We operate 24/7 across New Zealand and will dispatch a tow truck to collect your vehicle and transport it to a certified workshop for safe fuel system cleaning. Don't let a simple mistake become a major repair bill.