What to Do If You Accidentally Put Adblue in Your Diesel Tank
- Misfuelled Car Fixer Essex
- Mar 26
- 3 min read
0330 122 6640
Putting the wrong fluid into your vehicle’s fuel system can cause serious damage and costly repairs. One common mistake some diesel vehicle owners make is accidentally putting AdBlue into the diesel tank. This error can lead to engine problems and expensive fixes if not handled quickly and correctly. If you find yourself in this situation, knowing the right steps to take can save you time, money, and stress.
What Is AdBlue and Why It Should Not Go in the Diesel Tank
AdBlue is a liquid solution made of urea and deionised water. It is used in modern diesel vehicles equipped with Selective Catalytic Reduction (SCR) systems to reduce harmful nitrogen oxide emissions. AdBlue is stored in a separate tank and injected into the exhaust system, not the fuel tank.
Putting AdBlue in the diesel tank is a serious mistake because:
AdBlue is corrosive to engine components designed for diesel fuel.
It can cause clogging and damage to fuel injectors and pumps.
The engine may fail to start or run poorly.
Repairs can be expensive and time-consuming.
Understanding this difference is key to preventing damage and knowing why immediate action is necessary.
Signs You Have Put AdBlue in the Diesel Tank
Sometimes, drivers realise the mistake immediately, but other times symptoms appear only after driving. Common signs include:
Engine won’t start or struggles to start.
Rough idling or stalling.
Warning lights on the dashboard related to the engine or fuel system.
Unusual noises from the engine.
Sudden loss of power while driving.
If you notice any of these symptoms after refuelling, suspect AdBlue contamination and act quickly.
What to Do Immediately After Putting AdBlue in the Diesel Tank
If you realise you have put AdBlue in the diesel tank before starting the engine, do not turn the ignition on. Starting the engine will circulate the contaminated fuel and increase damage.
Follow these steps:
Do not start the engine. Keep the vehicle off.
Call our professional fuel recovery service (Misfuelled Car Fixer) to drain the tank safely.
Inform us about the AdBlue contamination so we can prepare the right tools and cleaning agents.
Avoid trying to fix the problem yourself unless you have experience with fuel system repairs.
If you have already started the engine, stop driving as soon as it is safe. Continuing to drive will spread the AdBlue through the fuel system, increasing repair costs.
How Our Professionals Fix AdBlue Contamination in Diesel Tanks
Cleaning AdBlue from a diesel fuel system requires special care. Professionals typically follow these steps:
Drain the entire diesel tank to remove all contaminated fuel.
Flush the fuel lines and filters to clear any remaining AdBlue residue.
Clean fuel filters as AdBlue can clog them.
Inspect fuel injectors and pumps for damage and repair or replace if necessary.
Refill with clean diesel fuel and test the engine for proper operation.
This process can take several hours and may require replacement parts depending on the extent of contamination.
How to Prevent Putting AdBlue in the Diesel Tank
Prevention is the best way to avoid this costly mistake. Here are some tips:
Always check the fuel cap and nozzle before refuelling. AdBlue nozzles are usually blue and smaller than diesel nozzles.
Fill AdBlue and diesel tanks separately and never confuse the two.
Read your vehicle’s manual to understand where each fluid goes.
Use reputable fuel stations with clear signage.
Ask for help if unsure when refuelling.
Being cautious and aware can prevent this error entirely.
What to Do If You Need Help or Advice
If you accidentally put AdBlue in your diesel tank and need professional assistance, contact a specialist who handles fuel contamination issues. For example, Misfuelled Car Fixer Essex offers expert help with AdBlue in diesel tank problems. You can reach us at 0330 122 6640 or visit our website here.
Getting expert advice quickly can reduce damage and repair costs.
How Much Does It Cost to Fix AdBlue in Diesel Tank Mistakes?
Repair costs vary depending on the vehicle and damage extent. Typical expenses include:
Draining and flushing the fuel system: £300–£700
Replacing fuel filters: £50–£150
Repairing or replacing fuel pumps or injectors: £600–£1000 or more
Early detection and stopping the engine immediately can keep costs lower.
Final Thoughts on Handling AdBlue in Diesel Tank Errors
Putting AdBlue in a diesel tank is a serious but fixable mistake. Acting quickly by not starting the engine and contacting a professional can save your vehicle from major damage. Knowing the difference between AdBlue and diesel, recognising symptoms, and taking preventive steps will help you avoid this problem in the future.
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