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Fuel Diesel: Diesel fuel, like gasoline is a complex blend of carbon and hydrogen compounds. It too requires additives for maximum performance. There are two grades of diesel fuel used in automobiles today: 1-D and 2-D. Number 2 diesel fuel has a lower volatility and is blended for higher loads and steady speeds, therefore works best in large truck applications. Because number 2 diesel fuel is less volatile, it tends to create hard starting in cold weather. On the other hand number 1 diesel is more volatile, and therefore more suitable for use in an automobile, where there is constant changes in load and speed.
| | Since diesel fuel vaporizes at a much higher temperature than gasoline, there is no need for a fuel evaporation control system as with gasoline. Diesel fuels are rated with a cetane number rather than an octane number. While a higher octane of gasoline indicates resistance to ignition, the higher cetane rating of diesel fuel indicates the ease at which the fuel will ignite. Most number 1 diesel fuels have a cetane rating of 50, while number 2 diesel fuel have a rating of 45. Diesel fuel emissions are higher in sulfur, and lower in carbon monoxide and hydrocarbons than gasoline and are subject to different emission testing standards. | |
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