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AdBlue in the fuel tank
AdBlue goes into its own blue-capped filler, often right next to the diesel cap. Pour it into the fuel tank and it's a very different problem from a petrol misfuel.
Do this now
- 1Don't start the engineDon't turn the ignition on either. Keyless? Keep the fob away from the car.
- 2Neutral and push clearAsk staff to help push the car away from the pump.
- 3Tell the cashierThey deal with misfuels every week.
- 4Call Mr FuelFixed price and arrival time on the phone.
On a motorway? Get behind the barrier first. In danger, call 999.
AdBlue is a urea solution. It doesn't mix with diesel, it sinks to the bottom of the tank, and when it reaches the pump it can crystallise and corrode. Don't turn the ignition on at all — even priming the pump can draw it in.
Signs you need us
- You filled the diesel filler from an AdBlue bottle or pump
- AdBlue went in the wrong cap on a van or HGV
- The engine ran rough or stopped after topping up AdBlue
How we fix it
- 1Don't power onLeave the ignition off — on keyless cars, keep the key away from the car.
- 2Specialist drainThe tank is drained and the contaminated mix removed. AdBlue must not be left sitting in the tank.
- 3Flush and inspectWe flush the tank and check filter and lines for crystals or contamination.
- 4AdviceIf AdBlue has reached the pump, we'll tell you plainly and advise dealer inspection rather than refuel and hope.
Good to know
- AdBlue that reaches the pump and injectors can cause expensive corrosion.
- Some manufacturers require component replacement after AdBlue contamination — we'll tell you if that's likely.
FAQs
AdBlue in the fuel tank: questions
Is AdBlue in the fuel tank worse than petrol?+
It can be, if it reaches the fuel system. Caught before the ignition is switched on, a drain and flush is often all that's needed.
What about diesel in the AdBlue tank?+
That's a contamination of the emissions system rather than the engine. Don't drive — call us and we'll advise; it usually needs the AdBlue tank and lines cleaned or the dealer involved.
Related
Other problems we fix
AdBlue in tank help near you
Wrong fuel? Don't start the engine.
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