DEF Tank Contamination Prevention
DEF Tank Contamination Prevention

DEFBooty FAQ's

  1. What is the DEFBooty for?

    All major off-road equipment manufacturers suggest that you wipe off the blue DEF cap and surrounding areas prior to filling. The highest probability of contamination occurs during the refilling process. The DEFBooty is designed to ensure that the DEF cap and surrounding areas are clean prior to refilling the DEF tank.


  2. How much does it cost?

    You can expect to spend $100 or so per year on smaller Tier 4 Final equipment. A good estimate on the annual cost of DEFBootys per piece of equipment is approximately 1/10 of your equipment’s initial investment cost. In other words, the cheapest insurance ever.


  3. How does it work?

    Clean the entire area around the DEF tank cap including the neck and top of tank. This is only required on the initial installation. Slip a new DEFBooty over the top of the DEF cap. Stretch the secondary elastic band over the DEFBooty to secure it around the base of the DEF cap. Fan out the DEFBooty apron to protect the surrounding area. When it’s time to refill your DEF tank, simply pinch any part of the DEFBooty apron and pull the DEFBooty off the top of the DEF cap. You do not have to remove the secondary elastic before doing this. The underside and surrounding area will be clean. Fill the DEF tank with new DEF fluid, replace the DEF cap and install a new, clean DEFBooty.


  4. What is Diesel Exhaust Fluid (DEF)?

    Diesel Exhaust Fluid (DEF) is a non-hazardous solution of 32.5% urea and 67.5% de-ionized water. DEF is sprayed into the exhaust stream of diesel vehicles to break down dangerous NOx emissions into harmless nitrogen and water. This system is called Selective Catalytic Reduction (SCR). DEF is not a fuel additive and never comes in contact with diesel fuel. It is stored in a separate tank, typically with a blue filler cap.


  5. Why is it so important to keep DEF free of contaminants?

    Impure DEF can clog your DEF injector and damage expensive components within the SCR systems. If this happens, your SCR system will be seriously damaged and most likely will NOT be covered under your warranty. As little as one tablespoon of dirt can contaminate an entire 500 gallon tote of DEF.


  6. Couldn’t I just use a plastic grocery bag?

    Yes, you could. But what happens when it falls apart and embeds itself in the fins of the radiator or gets caught up in a fan belt? The DEFBooty is made of durable polyethelyne that doesn’t tear easily. You might save a few dollars in the short term, but long term could end up costing thousands in a repair bill.


  7. What about the DEF nozzle?

    Another concern is having a dirty DEF nozzle. A clean nozzle inserted into a dirty DEF receptacle equals contaminated nozzle and tank! You can use the underside of the DEFBooty to wipe off the nozzle before refilling your DEF tank.


  8. What are the dangers of filling the DEF tank with diesel fuel?

    If the DEF tank is filled with diesel fuel it can cause significant damage to the SCR system that may require costly repair or far more costly replacement of the catalyst. The DEFBooty clearly identifies which tank is to be filled with DEF, avoiding this mistake.


  9. What are the dangers of filling the diesel fuel tank with DEF?

    Since DEF is composed of over 67% de-ionized water, it is basically like putting water in your diesel tank. Water can cause severe problems within an engine, like causing the fuel injector tips to explode or cause sudden cooling of an engine.  The DEFBooty clearly identifies which tank is to be filled with DEF, avoiding this mistake.


  10. Can the DEFBooty be recycled?

    Yes! The DEFBooty is made of recyclable polyethylene.


  11. Is the DEFBooty disposable?

    Yes! The DEFBooty is designed to be used in between DEF fuel fill-ups. When it is required to refill the DEF tank, a new DEFBooty should be used once filling is complete.

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