What happens if you put DEF in a gasoline engine?

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Putting Diesel Exhaust Fluid (DEF) into a gasoline engine or the fuel tank can have serious consequences and should be avoided at all costs. DEF is not designed for use in gasoline engines, and mixing it with gasoline can lead to engine damage and potentially costly repairs.

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What happens when DEF is accidentally introduced into the fuel tank of a gasoline or diesel engine?

The following may occur:

Poor Engine Performance: The gasoline engine may run poorly or may not start at all. DEF is not a fuel additive, and its introduction into the fuel system disrupts the combustion process in gasoline engines, leading to irregular engine operation.
Crystallization and Component Damage: When DEF comes into contact with components in the fuel system, it can cause crystallization and clogging. This can lead to damage to the fuel injectors, fuel pump, and other fuel system components.
Costly Repairs: Fixing the damage caused by DEF in a gasoline engine can be expensive. The fuel system components that have been contaminated with DEF may require cleaning or replacement.

To prevent such incidents, it is crucial to ensure that DEF is used only in diesel engines equipped with Selective Catalytic Reduction (SCR) systems. To avoid accidental misplacement of DEF in the fuel tank, clear signage and educational materials can be used to alert drivers and operators about the proper use of fluids. Employing proper training and procedures for handling DEF can help reduce the likelihood of such mistakes at facilities where DEF is used.

In case DEF is mistakenly added to the fuel tank of a gasoline engine, immediate action is necessary. Starting the engine can cause further damage and result in significant repair costs. Instead, the truck should be taken to a certified mechanic right away to address the issue properly.