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Why is diesel difficult to ignite despite its low flash point?

1 Answers

JudeLynn

07/30/25 8:05am

Diesel has a relatively large molecular weight, which makes it less volatile. Only volatile substances can form explosive mixtures. The flash point is the lowest temperature at which a liquid vaporizes to form an ignitable mixture with air under specific test conditions when exposed to an ignition source. Flash ignition occurs when sufficient vapor is produced on the liquid's surface to mix with air and form a combustible gas, resulting in a brief flame upon contact with a fire source, which extinguishes immediately. The flash point of gasoline is approximately 90°C lower than that of diesel. Precautions for fuel tank usage are as follows: 1. Do not wait for the fuel warning light to come on before refueling: Drivers should check the fuel gauge before driving and calculate whether refueling is necessary based on the trip distance and fuel gauge reading. It is advisable to refuel in advance rather than waiting for the warning light to come on. The fuel pump is located inside the tank and operates at high temperatures when continuously working. Being submerged in fuel helps cool it effectively. When the warning light comes on, it indicates the fuel level is below the pump. Repeatedly waiting for the light to come on before refueling will shorten the pump's lifespan, and having too little fuel in the tank may even burn out the pump. 2. Choose to refuel in the morning or evening: Generally, temperatures are lower in the early morning and evening, and gasoline's vaporization point is relatively low, making these times ideal for refueling. Gasoline expands with heat and contracts with cold, and it is sold by volume. At lower temperatures, gasoline's density is relatively higher, increasing the mass per unit volume, resulting in more fuel per refill. 3. Avoid filling the tank completely when driving in the city: For regular city driving, there is no need to fill the tank completely. A full tank increases engine load and fuel consumption. Since refueling is convenient in urban areas, it is unnecessary to fill the tank to the brim.

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