The following FAQs should shed light on the topic of misfuels or misfuelling to allay any concerns you may have surrounding the issue of pumping petrol in a diesel vehicle’s tank.

What is “misfuelling”?

Simply put, misfuelling takes place when you pump petrol into the fuel tank of a diesel vehicle.
This can happen as the pump nozzle on a diesel pump has a larger diameter than an unleaded fuel nozzle and so the unleaded nozzle can easily fit into the filler neck of the diesel tank.
It only takes the slightest distraction for someone to make this error, and the consequences can be costly, anything from in the region of $300 to over $8,000, depending on how much damage is done to your vehicle. The worst case scenario of course is that the entire fuel system needs replacing.
The worst thing you can do is drive off the forecourt once you have pumped petrol into your diesel vehicle. If you have left the fuel station, call your roadside assistance organisation and have your vehicle towed or transported to a garage where the fuel tank can be flushed of petrol and refilled with diesel. Please note, misfuelling is not normally covered under your roadside assistance agreement and the cost of draining your tank usually starts at about $250.00.
Thus, the Diesel Head Misfuel Prevention Device can save you a lot of money for a small upfront investment [store link here] fit and forget!

How frequently does it occur?

Misfuel numbers point to around 30,000 incidents a year in New Zealand alone, that is one every 15 minutes. If it has just happened to you, you are certainly not alone.
Is it on the increase?
Sadly, yes. With car manufacturers slow to catch up, there are still millions of diesel tanks without an OEM misfuel prevention device such as Diesel Head installed.

Why is it on the increase?

One theory is two car families: with petrol and diesel vehicle sales remaining equal, a growing number of households have one of each so drivers are having to become used to filling from both pumps!

Misfuelling – Battle of the Sexes!

Research actually shows men are more likely to misfuel than women but, whichever sex is in the dock, be prepared to dig deep to get the diesel vehicle fixed. If, having misfuelled, a motorist doesn’t start the engine, he or she may get away with just having the tank flushed. Road side rescue will do this for approximately $200.00 at the time of writing this. However, if the driver starts the vehicle, the sky may be the limit as the diesel engine and fuel system grind to a halt. That is without factoring in the cost of properly licensed disposal of the contaminated fuel.

Can you insure against it?

Yes, but at over $100.00 a year in terms of premiums plus an insurance excess, fitting a Diesel Head Misfuel Prevention Device is really more cost effective. Insurance can cover the funds but it cannot save you the grief, inconvenience and lost time that misfuelling causes, never mind the consequences of you not completing that particular trip on time!

Does it invalidate your warranty?

There is no doubt that engine and fuel system damage can be caused by running the wrong fuel, So if, as a result, your car is taken to a dealership with a view to claiming on the warranty for major component failure you may be in for a shock.

Will running petrol through my engine damage it?

Diesel lubricates the fuel system. Petrol is a solvent and quickly removes any protection. Expensive, high-pressure fuel pumps can be stripped and metal pieces blasted throughout the system. Having to replace an engine is rare, but renewing the fuel system and injectors typically costs around $8,000.  The best approach is to resolve the issue of petrol in diesel by fitting a misfuel prevention device.

Does size matter?

Yes, of course. The standard and lockable Diesel Head Misfuel Prevention Devices have been designed to offer strength and security via their robust engineering, while also features low profiles to fit precisely in as many vehicles as possible.

Has it been subjected to rigorous testing?

Yes it has. Click Here to view the certificate of conformity.