AdBlue in Diesel Tank: What You Need to Know

Diesel vehicles with modern emission systems are designed to use AdBlue, but only in the exhaust system—not in the fuel tank. Unfortunately, many drivers accidentally pour AdBlue into their diesel tank, thinking it works like a fuel additive. This mistake can cause serious problems if not handled quickly.

In this article, we’ll explain what AdBlue is, why it should never mix with diesel, what happens if it does, how to fix the problem, and how to avoid it in the future.

Why AdBlue Doesn’t Belong in a Diesel Tank

Diesel engines are built to run on fuel only. They rely on precise fuel injection systems that can be easily damaged by contamination. AdBlue contains water and chemicals that are highly corrosive to metal components. If it enters the fuel system, the risks include:

• Fuel contamination – Diesel mixed with AdBlue loses its combustion properties.
• Corrosion – AdBlue damages injectors, pumps, and metal lines.
• Blockages – AdBlue crystallizes when heated, clogging fuel filters and injectors.
• Engine failure – If ignored, contamination may destroy the entire fuel system.

What Happens if AdBlue Gets in the Diesel Tank?

The outcome depends on one critical detail—whether the engine was started.

• Engine not started
  If you notice the mistake before starting the car, you’re in luck. The tank can be drained and cleaned before AdBlue spreads through the system.
• Engine started
  Once the engine runs, AdBlue mixes with diesel and circulates through fuel lines, pumps, and injectors. This leads to serious damage that can cost thousands to repair.

Steps to Take Immediately

If you’ve accidentally added AdBlue to your diesel tank, follow these steps:

1. Do not start the engine
   This is the most important step. Starting the car spreads AdBlue and makes the damage worse.
2. Call a professional wrong fuel rescue service
   Companies like Rapid Fuel Rescue in Perth specialize in draining and cleaning fuel tanks safely.
3. Have the system drained and flushed
   A full flush removes contamination and prevents long-term damage.
4. Refill with clean diesel
   Once the system is safe, refill with fresh diesel fuel and continue driving normally.

Cost of Fixing AdBlue in Diesel Tank

The cost depends on the extent of contamination:

• Simple tank drain (if engine wasn’t started): $200–$400
• Full fuel system flush: $400–$800
• Major engine damage (if driven with contamination): $2,000–$8,000+

The sooner you act, the less you’ll pay.

How to Prevent AdBlue Misfuelling

Most cases of AdBlue in diesel tanks happen by accident. Here are some ways to prevent it:

• Double-check before filling – Diesel and AdBlue caps are different sizes and usually color-coded.
• Don’t rush – Many misfuelling mistakes happen when drivers are distracted or in a hurry.
• Store AdBlue separately – If you keep AdBlue at home, always use clearly labeled containers.
• Use anti-misfuelling devices – Some vehicles include protective mechanisms, but if yours doesn’t, aftermarket devices are available.

FAQs 

Q1. What happens if I put AdBlue in my diesel tank?

AdBlue will contaminate your fuel and damage the fuel system. If the engine isn’t started, the tank can be drained. If it’s started, expensive repairs may be needed.

Q2. Can AdBlue ruin a diesel engine?
Yes. Once it enters the fuel system, AdBlue can corrode injectors, pumps, and other parts, leading to engine failure.

Q3. Can I drive a car with a little AdBlue in the tank?
No. Even a small amount can damage the system. Do not drive—call for a rescue service immediately.

Q4. Can I fix AdBlue contamination myself?
It’s not recommended. Professional equipment is needed to drain, flush, and safely dispose of contaminated fuel.

Q5. How do I know if AdBlue got into my diesel tank?
If you accidentally used the wrong nozzle or container, assume contamination. If the engine runs, you may notice misfiring, smoke, or failure to start.

Q6. Does insurance cover AdBlue in the fuel tank?
Some policies cover misfuelling, but many don’t. Check your insurance terms.

Q7. How much does it cost to fix the issue?
Anywhere from a few hundred dollars to several thousand, depending on whether the engine was started.

Q8. Can Rapid Fuel Rescue fix AdBlue contamination?
Yes. Rapid Fuel Rescue provides fast wrong fuel rescue services, including AdBlue contamination, across Perth and surrounding areas.

Final Thoughts

AdBlue plays a crucial role in reducing emissions in modern diesel vehicles—but it should never go in the fuel tank. Even small amounts of contamination can cause significant damage.

If this mistake happens, the best step is to avoid starting the engine and call a professional fuel rescue service. Acting quickly can save you from costly repairs and downtime.

Accidentally put AdBlue in your diesel tank? Don’t panic—Rapid Fuel Rescue is here to help. As Perth’s trusted experts in wrong fuel rescue, we provide fast, safe, and affordable AdBlue contamination recovery. Whether you’re in Midland or within 70kms, our mobile team will drain, flush, and refill your tank so you can get back on the road safely.