The other difference is Diesel engines ignite the fuel by compressing it rather than with a spark.
(Also Diesel is the engine type not the fuel http://en.wikipedia.org/wiki/Diesel_engine)
(Also Diesel is the engine type not the fuel http://en.wikipedia.org/wiki/Diesel_engine)
Diesel engines work on what's called adiabatic compression heating. In other words, the compression causes the air to heat to a point higher than the ignition point of the fuel. Diesel engines usually use glow plugs to compensate for the lack of adiabatic compression heating when the engine is cold.