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Can you use diesel in place of fuel oil?

No, you generally cannot use diesel fuel in place of fuel oil. While both are petroleum-based fuels, they have different properties and are not interchangeable. Using diesel in a fuel oil system can cause serious problems, including:

* Damage to the burner: Diesel fuel has different viscosity and ignition properties than fuel oil. This can lead to improper combustion, clogging of fuel lines, and damage to the burner nozzle and pump.

* Incomplete combustion: Resulting in reduced heating efficiency and potentially dangerous carbon monoxide buildup.

* Warranty voidance: Using the wrong fuel will likely void any warranty on your heating system.

Fuel oil is specifically formulated for use in oil-fired heating systems. Diesel is designed for diesel engines and has different characteristics. Always use the fuel specifically recommended by the manufacturer of your heating system.