What Happens If You Put Diesel In The Def Tank

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Customer states put DEF in diesel tank and ran truck until it died ...

Diesel in the DEF Tank: Consequences and Mitigation

A Costly Mistake

I recently witnessed a harrowing scene at a gas station. A frantic motorist, oblivious to the gravity of his actions, mistakenly poured diesel into the Diesel Exhaust Fluid (DEF) tank of his pickup truck. As I approached him, offering assistance, I could sense his growing panic. Little did he know that this seemingly innocuous error would lead to costly consequences.

DEF: A Critical Role in Emissions Control

DEF, a non-toxic urea solution, plays a crucial role in modern diesel engines. Injected into the exhaust system, it reacts with harmful nitrogen oxides (NOx) emitted by the engine, effectively converting them into harmless nitrogen and water vapor. DEF tanks are typically located near the fuel tank and are easily distinguishable by their blue caps.

Composition and Function

DEF consists of 32.5% urea and 67.5% deionized water. Urea, an organic compound, reacts with NOx to form nitrogen and carbon dioxide. The carbon dioxide then combines with water to form carbonic acid, which neutralizes the NOx, rendering it environmentally benign.

Diesel Contamination Devastates DEF System

Diesel fuel, a hydrocarbon-based liquid, is incompatible with DEF. When mixed in the DEF tank, diesel contaminates the fluid, impairing or even destroying its ability to reduce NOx emissions.

  • Crystallization and Injector Clogging: Diesel in DEF can lead to crystal formation, which clogs the injectors that spray the fluid into the exhaust system. Clogged injectors prevent proper DEF injection, reducing emissions control efficiency.
  • Sensor Damage: Diesel contamination can also damage the sensors that monitor DEF levels and quality. Faulty sensors provide erroneous readings, potentially resulting in the vehicle entering limp mode or even causing engine damage.
  • Exhaust System Corrosion: Diesel left in the exhaust system can cause premature corrosion of components, including the catalytic converter and particulate filter.
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Tips for Avoiding DEF Contamination

Preventing DEF contamination is essential for maintaining both vehicle performance and compliance with emissions regulations. Here are some expert tips to keep in mind:

  • Pay Attention to Fueling Signs: Gas stations typically display clear signs indicating the location of DEF tanks and the correct fuel type. Pay careful attention to these signs before fueling.
  • Use Dedicated DEF Pump: Look for separate pumps designated for DEF. Avoid using fuel pumps or nozzles intended for diesel or gasoline.
  • Check Fuel Cap Color: DEF tanks usually have blue caps, while fuel tanks have black or green caps. Confirm the cap color before refueling.
  • Securely Tighten Caps: Ensure both the DEF and fuel tank caps are securely tightened after refueling to prevent spills or contamination.

FAQ on DEF Contamination

Q: Can I dilute diesel with DEF?
A: Absolutely not. DEF should never be diluted with diesel or other liquids. Diluting DEF weakens its ability to control emissions and can damage the DEF system.

Q: What should I do if DEF accidentally gets into the diesel tank?
A: If diesel contamination occurs, do not operate the vehicle. Contact your vehicle manufacturer or a qualified mechanic immediately. Attempting to operate the vehicle with contaminated DEF can cause extensive damage.

Q: How much diesel in DEF is too much?
A: Even a small amount of diesel contamination can harm the DEF system. Therefore, any amount of diesel in the DEF tank is considered unacceptable.

Conclusion

Diesel in the DEF tank is a serious issue that can lead to costly repairs and reduced engine performance. By paying attention to fuel types, using dedicated DEF pumps, and checking fuel cap colors, you can help prevent DEF contamination. If you suspect diesel contamination, seek professional assistance immediately to minimize potential damage.

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Are you interested in learning more about Diesel Exhaust Fluid (DEF) and its role in emissions control? If so, explore our blog further for valuable insights and expert advice.

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