Small Amount of AdBlue in Diesel Tank by Mistake

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Adding small amount of AdBlue in diesel tank by mistake can cause serious problems. One common mistake some diesel vehicle owners make is accidentally putting AdBlue into the diesel tank. Even a small amount of AdBlue in the diesel tank can lead to costly damage if not handled properly. This post explains what happens when AdBlue enters the diesel tank, how to recognize the problem, and the steps you should take to protect your vehicle.

Diesel fuel tank filler with nozzle

What to Do if Small Amount of AdBlue in Diesel Tank by Mistake

AdBlue is a liquid solution made of urea and deionized water. It is used in 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.

Diesel fuel powers the engine, while AdBlue helps clean exhaust gases. Mixing AdBlue with diesel fuel causes chemical reactions that can damage the fuel system, engine components, and emission control systems. Even a small amount of AdBlue in the diesel tank can cause corrosion and clog fuel filters.

Signs You May Have Added AdBlue to the Diesel Tank

If you accidentally add AdBlue to your diesel tank, you might notice some warning signs quickly:

• Engine warning lights turn on, especially related to emissions or fuel system.

• The engine runs roughly or misfires.

• You experience loss of power or poor acceleration.

• The vehicle may stall or fail to start.

• You might smell a strong chemical or ammonia-like odor from the exhaust.

  
  

If you notice any of these symptoms after refueling, stop driving immediately and check the fuel type you added.

Immediate Steps to Take After Adding AdBlue to Diesel Tank

If you realize you have put AdBlue into the diesel tank, act quickly to minimize damage:

1. Do not start the engine if you haven’t already. Starting the engine will circulate the contaminated fuel and increase damage.

2. Call our roadside assistance at 07459 909935 to drain the fuel tank safely.

3. If you have already started the engine, stop driving as soon as possible.

4. Inform the mechanic about the mistake so they can take appropriate steps to clean the fuel system.

   
   

How Mechanics Handle AdBlue Contamination in Diesel Tanks

Professional mechanics follow a thorough process to fix the problem:

• Drain the entire fuel tank to remove all contaminated fuel.

• Flush the fuel lines, fuel pump, and injectors to clear any traces of AdBlue.

• Inspect the fuel system for corrosion or damage caused by the urea solution.

• Refill the tank with clean diesel fuel.

• Test the engine and emission systems to ensure everything works correctly.

  
  

This process can be costly, especially if the vehicle was driven with contaminated fuel. Early detection and stopping the engine immediately reduce repair costs.

Preventing AdBlue Mistakes in the Future

To avoid accidentally adding AdBlue to your diesel tank, follow these tips:

• Always check the fuel cap label before refueling. Diesel and AdBlue tanks have different caps and labels.

• Use different colors and shapes of nozzles at fuel stations to help distinguish between diesel and AdBlue.

• If you drive a diesel vehicle with SCR, familiarize yourself with the location of both tanks.

• When refueling, take your time and double-check the fluid you are adding.

• Educate other drivers who may use your vehicle about the difference between diesel and AdBlue.

  
  

What Happens If You Drive With AdBlue in the Diesel Tank

Driving with AdBlue in the diesel tank causes several problems:

• The urea in AdBlue reacts with diesel fuel, causing corrosion of metal parts inside the fuel system.

• Fuel filters become clogged with crystals formed by the urea solution.

• Injectors and fuel pumps may fail due to contamination.

• The engine may stall or lose power due to improper combustion.

• The SCR system and emission controls can be damaged or malfunction.

  
  

The longer you drive with contaminated fuel, the more severe the damage and the higher the repair costs.

How Much Damage Does a Small Amount of AdBlue Cause?

Even a small amount of AdBlue in the diesel tank can cause problems, but the extent depends on the volume and whether the engine was started:

• If the engine was not started, draining and flushing the system usually prevents damage.

• If the engine ran briefly, damage might be limited to clogged filters and minor corrosion.

• If the vehicle was driven for a long time, fuel system components may need replacement.

  
  

The key is to act fast and avoid running the engine once the mistake is discovered.

Can You Fix It Yourself?

Fixing AdBlue contamination requires draining and flushing the fuel system, which is complex and requires special tools. Attempting to fix it yourself without experience can cause more damage or safety risks.

It is best to contact a professional mechanic or roadside assistance immediately. They have the equipment and knowledge to handle the problem safely.

Summary and Next Steps

Accidentally adding AdBlue to your diesel tank is a serious mistake but can be managed if you act quickly. Stop the engine immediately, avoid driving, and get professional help to drain and clean the fuel system. Early action reduces damage and repair costs.

To prevent this error, always double-check the fluid you are adding, know the location of your AdBlue and diesel tanks, and pay attention to fuel station nozzles and labels.