What is Diesel Exhaust Fluid (DEF)?
Diesel Exhaust Fluid (DEF) is a solution of urea and water that’s injected into the exhaust stream of diesel vehicles to turn NOx gases (harmful emissions) into nitrogen and water. This system is called a Selective Catalytic Reduction (SCR) implemented by vehicle manufacturers to meet EPA emissions standards in 2010. This is a way of meeting the standards without compromising engine performance or fuel efficiency. DEF is not a fuel additive and is stored in separate tanks.
Who needs DEF, why?
DEF is a requirement for medium- and heavy-duty vehicles with diesel engines produced after 2010. The vehicle is programmed to inject the DEF into the exhaust stream to meet emissions requirements. If the vehicle is allowed to run out of DEF, the engine performance will be reduced, and lower speeds are imposed.
What are the different delivery modes of DEF?
DEF can be purchased in several ways. There are varying sizes of jugs/containers the user can purchase. This requires the driver to transfer the DEF into the vehicle manually. DEF can also be dispensed into the vehicle through a fueling dispenser when equipped.
How can an operator determine how much DEF they will need/use?
DEF consumption will be approximately 2% of the diesel fuel consumed. Another way to consider it is that DEF will be consumed on a 50 to 1 ratio with diesel. (For every 50 gallons of diesel fuel burned, you
will use 1 gallon of DEF). If you know the average fuel consumption of a vehicle, you can easily calculate the amount of DEF that will be used.
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