Is your car at risk? Aussie drivers stranded after shocking petrol contamination

If you’ve ever filled up your tank and driven off with a sigh of relief—only to have your car splutter to a halt moments later—you’ll know just how distressing a bad batch of fuel can be.

That’s exactly what happened to a group of unsuspecting drivers in Melbourne’s eastern suburbs, who found themselves stranded and facing hefty repair bills after filling up at a local 7-Eleven.



The incident unfolded at the 7-Eleven on Hawthorn Rd in Nunawading, where several motorists reported their vehicles breaking down almost immediately after refuelling.

Some cars wouldn’t even start, while others died just moments after leaving the pump.

As one frustrated customer put it, ‘All these cars, every single one that is here is ruined because of water in their fuel.’

It wasn’t just one type of petrol affected, either. According to customer Michael Hennessey, ‘Diesel, 98 is totally stuffed and 91.’ In other words, no matter what you were driving or what you were filling up with, you were at risk.


Screenshot 2025-08-18 at 13.47.07.png
Drivers in Melbourne’s east were left stranded after filling up with contaminated petrol at the 7-Eleven on Hawthorn Rd, Nunawading. Image source: 7News Australia / Youtube.



Despite customers’ pleas for staff to stop selling fuel, the pumps reportedly kept running for some time before the issue was finally addressed.

7-Eleven has since confirmed that the problem was isolated to this single store, and fuel sales were suspended as soon as the contamination was discovered.

While the exact cause is still under investigation, early reports suggest that Melbourne’s recent heavy rainfall may be to blame.

Water can sometimes seep into underground fuel tanks if they’re not properly sealed or maintained, leading to a dangerous mix that can wreak havoc on engines. It’s a rare but serious issue—water in your petrol or diesel can cause everything from stalling and rough running to catastrophic engine damage.



If you’re unlucky enough to fill up with contaminated fuel, the symptoms are usually hard to miss. Your car might:

- Stall or refuse to start
- Run roughly or misfire
- Display warning lights on the dashboard
- Suffer from reduced power or acceleration

In severe cases, water in the fuel can cause corrosion or damage to sensitive engine components, leading to expensive repairs. For many of the drivers affected in Nunawading, the damage was immediate and severe.


Source: 7News Australia / Youtube.​


What Should You Do If You Suspect Bad Fuel?
If you ever suspect you’ve filled up with contaminated petrol or diesel, here’s what you should do:

1. Stop driving as soon as it’s safe. Continuing to run the engine can make the damage worse.
2. Contact the service station immediately. Report the issue and ask if there have been other complaints.
3. Keep your receipt. Proof of purchase is essential for any compensation claim.
4. Get your car checked by a mechanic. They can confirm if water or other contaminants are present in your fuel system.
5. Contact your insurer. Some policies may cover damage caused by contaminated fuel.



Under Australian Consumer Law, you’re entitled to a remedy if a business sells you a faulty product—including contaminated fuel.

In this case, 7-Eleven has stated that affected customers will be contacted and offered compensation. This could include covering the cost of repairs, towing, and even alternative transport while your car is off the road.

If you ever find yourself in a similar situation and the service station isn’t cooperating, you can escalate your complaint to the ACCC or your state’s consumer protection agency.

Key Takeaways

  • Drivers in Melbourne’s east were left stranded after filling up with contaminated petrol at the 7-Eleven on Hawthorn Rd, Nunawading.
  • The watered-down fuel caused engines to break down immediately, with several cars left unable to start shortly after refuelling.
  • Customers reported that fuel containing diesel, 98 and 91 octane was completely unusable, and some accused the store of continuing to sell fuel despite warnings.
  • -Eleven stated the issue was limited to this one site, suspended fuel sales during the investigation, and will contact affected customers to offer compensation.

Have you ever been caught out by bad fuel? Do you have any tips for fellow drivers on how to avoid this kind of disaster? Share your stories and advice in the comments below!
 

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Why do they never take the blame and instead pass it off to something else like water seeping into the storage tanks which I find a bit hard to believe.

I hope the victims get their compensation quickly although I'm not liking their chances.

We filled up the other day and found the meter was ticking over before the petrol actually came out. I think it was up to $5 before the petrol came out.
When we went to pay and told the guy about it he refused to listen. We have since found out it had happened to a friend who also filled up there.

Servo was on Georges River Rd Croydon Park
 
On good authority from 2 tanker driver mates, Never put fuel in your car while the tanker is there delivering fuel as it is under pressure & stirs up fuel in storage tanks & any contaminates can be pumped into your vehicle.
 
What Yatesy says is true. Many years ago I was involved in this industry and went to the US to look at thing there. They brought in regulations to stop tank leaking both into and from. Servos had to have tanks within a tank and sensors in between the two tanks to sense any water leakage in or fuel leakage out. I have no idea what the current regulations are as I have been out of that business for years, but that seemed very sensible to me. There was a site in Tweed Heads that was closed for many years as the ground was decontaminated from a leaking tank.
 
How can water in fuel cause catastrophic engine damage?
 
Looks as though a 'Class" insurance action could well take place with numerous cars & their drivers affected.

I reckon that repair costs could be extremely dear plus the costing of the petrol purchased.

No doubt at all, the 7 eleven outlet is absolutely at fault.

We wish all of the affected customers the very best in any attempt to claim compensation from them.
 
How can water in fuel cause catastrophic engine damage?
During the compression stroke, the whole engine timing is thrown out due to the fact that water is not compressible, unlike fuel vapour.

Hence all engine components connected to the timing process get shredded.

That's my explanation with limited mechanical knowledge.
 
Was it raining when the fuel delivery truck pumped fuel into it??. I have heard of that happening.
 
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I don't go to any fuel statios, I stay with the same one, that way if I have problems I know just who to blame. Fortunately it hasn't happened.
 
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when I was young my boss used to put the garden hose into the ground tanks for 5 mins twice a week, the fuel was lighter and floated to the top, made him heaps $$$ maybe old tricks are coming back
 
when I was young my boss used to put the garden hose into the ground tanks for 5 mins twice a week, the fuel was lighter and floated to the top, made him heaps $$$ maybe old tricks are coming back
strange it affected ALL the ground tanks......different suppliers
 
Well it almost buggered up my mower.
About 35 years ago I had a late 1960s Corona that had a leaking head gasket and water was getting into the engine and leaving a long steam trial behind me and I had to top up the radiator every 15kms or it would overheat. Besides that it still drove as per usual
All I did was replace the gasket and all was good.
They don't make cars like they used to and lots used cast iron for the engine block and no computer controlled with heaps of sensors to fail back in the day.
That is my bet with the above story. A one computer sensor just has to fail and the whole engine stops or it sputters along.
 
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Why do they never take the blame and instead pass it off to something else like water seeping into the storage tanks which I find a bit hard to believe.

I hope the victims get their compensation quickly although I'm not liking their chances.

We filled up the other day and found the meter was ticking over before the petrol actually came out. I think it was up to $5 before the petrol came out.
When we went to pay and told the guy about it he refused to listen. We have since found out it had happened to a friend who also filled up there.

Servo was on Georges River Rd Croydon Park
Dear Suzanne, thankyou for your post. My sister had a similar issue. She filled up petrol at a 7/11 and on her way home, her car lost power and slowly stopped. She had it towed home, as it was a weekend with mechanics closed. When the RACV came, they extracted a sample of the petrol, the plastic sample tub had half petrol and the other half water. My sister took a photo of it and took the matter to VCAT. Surveillance cameras at the 7/11 were proof enough at the time that my sister was there, which correlated with the timing of the RACV attendance. VCAT ordered the Petrol company connected to the 7/11, to pay all mechanical costs to have the car repaired, from the damage caused by the contaminated petrol. Wishing you a pleasant. 🙏🦋
 
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Looks as though a 'Class" insurance action could well take place with numerous cars & their drivers affected.

I reckon that repair costs could be extremely dear plus the costing of the petrol purchased.

No doubt at all, the 7 eleven outlet is absolutely at fault.

We wish all of the affected customers the very best in any attempt to claim compensation from them.
Dear member Novezar, thankyou for your post. My sister had a similar issue and took the matter to VCAT. The petrol company connected to the 7/1l , were ordered to pay for all mechanical repaires to the car caused by the contaminated petrol. Call 7/11 and tell them that if they don't pay for your mechanical repairs, that were required due to their contaminated petrol, that you will be going to VCAT. Your proof of attendance to the petrol station can be found on the 7/11 CCTV cameras. If they refuse to pay, then make a report to VCAT. Wishing you success in your communication with VCAT. 🙏🦋
 
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Dear Suzanne, thankyou for your post. My sister had a similar issue. She filled up petrol at a 7/11 and on her way home, her car lost power and slowly stopped. She had it towed home, as it was a weekend with mechanics closed. When the RACV came, they extracted a sample of the petrol, the plastic sample tub had half petrol and the other half water. My sister took a photo of it and took the matter to VCAT. Surveillance cameras at the 7/11 were proof enough at the time that my sister was there, which correlated with the timing of the RACV attendance. VCAT ordered the Petrol company connected to the 7/11, to pay all mechanical costs to have the car repaired, from the damage caused by the contaminated petrol. Wishing you a pleasant. 🙏🦋
I wonder if someone is watering the petrol down 🤔
 
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How can water in fuel cause catastrophic engine damage?
Putting water in a fuel tank can lead to severe engine damage Water doesn't burn and can cause the engine to stall, or even seize, due to its inability to compress in the cylinders. It can also lead to corrosion of fuel lines and injectors, and other costly repairs.

Water is not compressible, unlike fuel. When water enters the combustion chamber, it can cause the engine to seize or experience hydrostatic lock, damaging pistons, connecting rods, and other engine components.
 
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I wonder if someone is watering the petrol down 🤔
Hi Suzanne, thankyou for your post. Isn't it a bit strange how the majority of these specific water in petrol contamination is happening at 7/11 stations. I wonder if it's the men who deliver the petrol, or the people working at 7/11 who could be the culprits. Why is this problem not happening at other petrol stations, why mostly at 7/11. Personally, I think it's something deliberate, so that they can sell more petrol, by watering half of it down with water. Just a suspicious thought. Wishing you a lovely evening. 🙏🦋
 

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