Can a Gasoline Car Use Diesel Fuel?

1 Answers
Hattie
07/24/25 6:00pm
Gasoline cars cannot use diesel fuel. Diesel engines operate on compression ignition, where diesel has a lower ignition point and does not require spark plugs to ignite. Instead, it relies on compressed air to reach the diesel's ignition point, at which point the diesel is injected and combusts spontaneously. If diesel enters a gasoline engine, it may ignite under compression before the spark plugs fire, leading to abnormal pressure in the combustion chamber and causing what is commonly known as engine knocking. Solution for accidentally adding diesel to a gasoline car: If diesel is added, avoid starting the engine to prevent diesel from entering the fuel system. Call for a tow truck to take the vehicle to a 4S shop, where the diesel can be drained completely. If the engine is started and diesel enters the fuel system, in addition to draining the diesel, a comprehensive inspection of the vehicle will be required at the repair shop.
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