Diesel Exhaust Fluid Article- Don’t Turn a DEF ear to low DEF.

Don’t turn DEF ear to low diesel exhaust fluid

Diesel exhaust fluid (DEF for short) is becoming more common as a key ingredient in diesel engine emission controls. Introduced to North American car drivers in certain Mercedes vehicles in 2006, it spread to the heavy trucking industry in 2007. Now DEF has hit the Detroit Three light truck market.

Ford, GM and certain Dodge diesels trucks come with an extra tank to carry the DEF necessary to meet emission regulations (the Dodge Ram 2500 and 3500 series meet the regulations without a DEF system).

DEF is essentially a 32-per-cent urea-water solution that is injected at a variable rate into the vehicle’s catalytic converter to reduce nitrous-oxide (NOx) emissions.

The amount injected is calculated by the main engine computer and varies dependent on engine load and speed as well as operating temperatures and several other in-puts. DEF is used, on average, at a rate of three per cent of the amount of fuel consumed.

When the DEF stream hits the hot inner surfaces of the catalytic converter it vaporizes and decomposes to form ammonia and carbon dioxide.

The ammonia is then used to convert the NOx emissions to harmless nitrogen and water.

For those who think the system is just another piece of technology that can be ignored, think again. If a DEF tank is left to run dry, the engine will not start.

If the tank runs low while the engine is running, a series of warning messages and lights will appear on the instrument cluster but the vehicle will continue to run until it is switched off by the driver (and then of course it will not restart).

DEF on-board tanks will hold about 30 litres of the fluid. Four-litre jugs can be purchased from most aftermarket parts stores or dealerships (that sell DEF vehicles) for around $12. In the U.S. many heavy truck refuel-ling centres dispense DEF at bulk pumps next to regular fuelling stations for as little as $4 U.S. a gallon.

REad the article at: The Ottawa Citizen

Reblogged by Lee Geurts with Krueger Sentry Gauge Company

Krueger Sentry Gauge manufactures a simple liquid level gauge for above ground bulk storage tanks that works great with DEF.

DEF Liquid Level Gauge

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