If you are ever in doubt if the correct fill hole was used, drain and flush the tank with deionized water or clean DEF fluid. Usually, the DEF fill hole is smaller in diameter. If you have machines where the DEF and diesel tanks are near each other, another easy way to tell the difference is the size of the fill holes. If that happens, and an operator starts a machine with DEF in the fuel lines, it can potentially cause tens of thousands of dollars in damage. But fuel and DEF tanks are close in proximity on some pieces of construction equipment, so it’s not surprising this mistake occurs. The liquid, which looks like water, is sprayed into the exhaust before it exits the machine.ĭEF should never be mixed with diesel fuel, and it has its own filling port.
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Here’s my advice on how to avoid them.ĭiesel exhaust fluid is an emissions control solution designed to lower the nitrogen oxide emissions in diesel engines. Inadvertently putting DEF into the diesel tankĪny one of these is a potentially major issue that can cause significant damage to your equipment.A common engine-related call involves diesel exhaust fluid (DEF). Every day, the Volvo Construction Equipment technical support team gets calls from customers covering any number of topics.
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