Discussion
In places with severe cold climate, the most important fuel property to be considered for running an internal combustion engine is __________.
Answer: C
The most important property is the pour point.
The pour point is the lowest temperature at which a fuel still flows. In very cold climates, diesel's waxy components crystallise as the temperature drops, the fuel thickens, and filters and lines can block so that the engine is starved of fuel. A fuel for such regions must have a pour point (and cloud point) below the lowest expected temperature, which is why winter grades of diesel are blended.
Heating value governs energy content and fuel consumption, flash point is a safety property for storage and handling, and boiling point (volatility) affects vaporisation, but none of these stops the fuel flowing at low temperature.
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