The Bottom Line
If you have poured AdBlue into your petrol tank, do not start the engine. AdBlue is not fuel, and it does not belong anywhere near your petrol system. The good news is the fix is the same as any wrong fuel job. Drain the tank, flush the lines, refuel with clean petrol, and you are back on the road.
Call Ben on 0416 692 022. We come to you across Perth and sort it on-site. No towing, no garage drop-off.
What Is AdBlue and Why It Ends Up in the Wrong Place
AdBlue is a water based fluid, mostly purified water with urea mixed in. Diesel cars use it to clean up exhaust emissions, and it goes into its own separate filler, usually next to the diesel cap or under the boot floor. It is not petrol, it is not diesel, and it never goes in the fuel tank of either.
It ends up in the wrong place easily. The AdBlue bottle looks a bit like a screen wash bottle. The filler can sit right next to the fuel cap. People top up in a hurry and pour it into the petrol tank without thinking. Wrong fuel happens to anyone, and this is one of the common ways it happens.
What AdBlue Does in a Petrol Tank
AdBlue is water based, so it does not burn like fuel. In a petrol tank it mixes with the petrol and gets drawn into your fuel system when the pump runs. That can mean the car will not start, or starts and runs very badly before cutting out.
Leave it sitting, or worse run the engine, and the water and urea can start to corrode and crystallise inside the pump, lines, and injectors. That is the part you want to avoid. The way you avoid it is simple. Do not start the car, and get the AdBlue out before it travels.
Do Not Start the Engine
This is the one rule that matters most. As long as the AdBlue is sitting in the tank and the engine has not run, the fix is a clean drain. The moment you start the car, the pump pulls the contaminated mix through the most expensive parts of the system. Do not turn the key to accessory either, since that primes the pump on many cars.
How We Fix It
It is the same on-site process we use for any wrong fuel job.
- Drain every drop of the AdBlue and petrol mix out of the tank
- Flush the fuel lines so nothing contaminated is left in the system
- Swap the fuel filter if it needs it
- Refuel with clean petrol
- Start the car and check it runs right before we leave
We come to you, wherever the car is. You do not need a tow truck and you do not need to leave the car somewhere for days.
AdBlue in a Diesel Tank Is a Different Job
If you put AdBlue in your diesel tank rather than petrol, that is a separate situation with the same golden rule. Do not start the engine. We cover that one in detail in our AdBlue in a diesel tank guide. Either way, the fastest path back to the road is to stop and call.
Wrong Fuel in Perth? We Are 24/7
Rapid Fuel Rescue is a dedicated wrong fuel and contamination service for Perth and WA. AdBlue, petrol, diesel, water, if it is in the wrong tank we drain it, flush it, and get you moving. Ben usually reaches jobs across the metro inside about an hour. Call 0416 692 022 while the car is still parked and off.
Frequently Asked Questions
Is AdBlue in a petrol tank serious?
It is a real problem, but it is very fixable if you do not start the car. AdBlue is water based, so it will stop the engine running properly and can corrode the fuel system over time. Caught before the engine runs, it is a straightforward drain and flush.
Will my car start with AdBlue in the petrol tank?
It might not start at all, or it might start and run very badly before stalling. Either way, do not keep trying. Every attempt pulls more of the mix through your fuel system.
Can I just top up with more petrol to dilute it?
No. Adding petrol does not remove the AdBlue, it just spreads a contaminated mix through the tank and lines. The only proper fix is to drain the tank and flush the system.
How long does it take to fix?
Most on-site drains take about 45 to 90 minutes depending on the car and tank size. We do the whole job at your location, so there is no towing or workshop wait.
