Steps to Take If AdBlue is Accidentally Added to a Diesel Tank

Modern diesel engines are more complex than ever, often equipped with advanced emission-control technologies. Among these systems is the use of Adblue in diesel, a liquid used to reduce harmful emissions in vehicles with Selective Catalytic Reduction (SCR) technology. However, mistakes happen, and occasionally, AdBlue might be accidentally added to a diesel fuel tank. Such errors can have significant consequences if not addressed promptly and properly.

This guide outlines the key steps to take if AdBlue is added to a diesel tank and how you can minimize damage to your vehicle.

Why It’s Important to Act Quickly

AdBlue is not a fuel; it is a urea-based additive designed exclusively for the SCR system. If it enters the diesel tank, it can react with the fuel and cause significant contamination. Once mixed, it can damage the fuel system components, leading to costly repairs. Acting swiftly is crucial to prevent severe damage and ensure the longevity of the vehicle.

Step-by-Step Actions to Take

Step 1: Do Not Start the Engine

The first and most critical step is to avoid starting the engine. Starting the engine will cause the fuel pump to circulate the AdBlue through the fuel system. Once this happens, the mixture can reach sensitive components such as injectors and filters, increasing the likelihood of damage.

If the vehicle has already been started before realizing the mistake, stop the engine immediately and proceed with the next steps.

Step 2: Assess the Volume of AdBlue Added

Knowing the amount of AdBlue added to the diesel tank can help mechanics assess the severity of the contamination. If only a few milliliters were added, the situation might be less critical than if a larger quantity has been introduced. However, in most cases, any amount of AdBlue in the diesel tank requires professional attention.

Step 3: Avoid DIY Solutions

While you might be tempted to drain the tank yourself, modern diesel vehicles have intricate systems that could be further damaged by improper handling. DIY attempts could also leave residual AdBlue, continuing to pose risks to the fuel system components.

Instead, it’s best to leave this task to technicians who are experienced in handling fuel contamination.

Step 4: Arrange for Professional Assistance

Contact a reliable mechanic or roadside assistance service immediately. They will likely recommend towing the vehicle to a service center. Attempting to drive the vehicle, even for short distances, can spread the contamination and exacerbate the issue. Most mechanics will drain and flush the fuel tank to remove all traces of AdBlue, ensuring that the fuel system is clean before refueling.

Step 5: Replace Fuel Filters and Inspect the System

Once the tank has been thoroughly drained and cleaned, replacing the fuel filters is highly advisable. AdBlue contamination might leave residues in the filters, which could compromise the engine’s performance in the long run. A professional inspection of the system can also detect and address any damage caused by the contamination.

Step 6: Refill the Tank With Fresh Diesel

After the fuel system has been flushed and approved for use, refill the tank with fresh, high-quality diesel. Using high-grade diesel can help ensure the engine runs smoothly and reduces the risk of lingering issues.

Benefits of Addressing AdBlue Contamination Promptly

Taking swift action to address AdBlue contamination in a diesel tank can save significant time, money, and hassle. Timely intervention helps prevent costly repairs, protects the engine’s performance, and ensures compliance with emission standards. Additionally, quick resolution helps maintain vehicle reliability, keeping it road-ready for daily use or long-haul journeys.