The Dangers of Adding AdBlue to Diesel Tanks

When it comes to diesel engines, precision and care are essential. Adding AdBlue to a diesel tank can lead to serious complications, from clogged filters to irreparable damage to the fuel injection system. This article explores the potential consequences of adding AdBlue to a diesel tank, offering insights from industry professionals and practical advice on how to avoid such mishaps.

Understanding the Hazards of Incorrect AdBlue Usage

Our example involves accidentally adding 2 liters of AdBlue to a 200-liter diesel tank. This seemingly small quantity of AdBlue can have significant repercussions, especially if left unaddressed. AdBlue, or diesel exhaust fluid (DEF), is specifically designed for diesel exhaust after-treatment systems. It is crucial to understand that AdBlue should never be directly added to a diesel tank; it should be kept in a separate, designated tank (typically with a blue cap).

Overflow and Clogging

The AdBlue, being more dense than diesel, tends to settle at the bottom of the tank. Over time, it can overflow into fuel filters and fuel water separators. This can lead to the clogging of these filters, affecting the overall performance of the engine. If the filters become fully clogged, AdBlue can continue to spread, eventually reaching the fuel injection pump and injectors. AdBlue is not a lubricant, and its presence in these components can cause severe damage, leading to inefficient fuel injection and, ultimately, engine failure.

Immediate Consequences on Engine Performance

If you attempt to start an engine with AdBlue in the diesel tank, the burn will be severely inhibited, causing the engine to stop almost immediately. The presence of AdBlue in the fuel system can lead to multiple issues:

Overflow of AdBlue into the fuel injection pump and injectors.

Urea in AdBlue decomposes to ammonia in the selective catalytic reducer (SCR), which can mix badly with diesel and not form a homogeneous mixture, leading to further issues.

The engine will stop working as the fuel mixture becomes unviable and polluted with liquid AdBlue.

Preventive Measures and Damage Control

The primary preventive measure is to ensure the AdBlue is stored in a separate tank designated for diesel exhaust fluid. However, if you do find yourself in a situation where AdBlue has been mistakenly added to a diesel tank, here are steps to take:

Drain the tank and remove any residual AdBlue to prevent it from spreading further.

Inspect the fuel lines, water traps, fuel filters, and fuel injection pump for any AdBlue contamination.

Flush and clean these components to ensure they are free of any AdBlue residue.

Seek professional help if necessary, as severe cases might require specialist cleaning and maintenance.

Expert Insights from Diesel Truck Drivers

Industry professionals, such as those who drive heavy diesel trucks, emphasize the importance of adhering to the correct protocols when using AdBlue. Adding AdBlue to a diesel tank can lead to extensive damage, including clogged filters, fuel injection pump and injector damage, and potential engine failure. If you are ever faced with such a situation, acting quickly to address the issue is crucial.

Conclusion

The consequences of adding AdBlue to a diesel tank can be severe, leading to engine performance issues and costly repairs. By understanding the importance of storing AdBlue in a separate tank and taking immediate action to address any contamination, you can avoid these problems and keep your diesel vehicle running smoothly.