What does it mean that gasoline cars cannot add diesel?

1 Answers
DelEmily
07/30/25 3:45am
What it means that gasoline cars cannot add diesel is that gasoline cars should be fueled with gasoline, and diesel cars should be fueled with diesel—gasoline cars must not be fueled with diesel. The reasons why gasoline cars cannot add diesel are as follows: Gasoline has a low carbon content, while diesel has a relatively high carbon content, and their densities also differ significantly. The relationship is similar to that between light water and heavy water, with gasoline and diesel being analogous to light oil and heavy oil, respectively. Compared to gasoline, diesel has a lower ignition point and is less volatile, while gasoline has a higher ignition point and is more volatile. In a gasoline engine, when the fuel injector sprays gasoline and the air entering through the throttle valve forms a mixed gas that enters the cylinder, diesel may ignite before the spark plug fires, causing abnormal pressure in the combustion chamber and resulting in knocking. Additional information on the consequences of adding the wrong fuel: 1. The fuel injector pressure in gasoline engines is lower than that in diesel engines. When diesel is added, it cannot be fully atomized, leading to incomplete combustion, resulting in engine power loss, unresponsiveness to throttle input, and the emission of black smoke from the vehicle. 2. Diesel has a low ignition point and may combust violently on its own before the spark plug fires, causing abnormal pressure in the combustion chamber, commonly known as knocking, which poses significant safety hazards.
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