During a heavy snowstorm, an excavator's engine stalls due to fuel starvation. The ambient temperature is -25°C. Which of the following is the most probable cause related to cold weather operations?

Question: During a heavy snowstorm, an excavator's engine stalls due to fuel starvation. The ambient temperature is -25°C. Which of the following is the most probable cause related to cold weather operations?

Answer options:

• Defective fuel pump due to cold-induced wear.
• Water contamination in the fuel lines freezing. ✅ Rapid formation of paraffin wax crystals in the fuel, blocking the filter.
• Electrical short circuit in the fuel system due to ice accumulation.

Correct answer: Rapid formation of paraffin wax crystals in the fuel, blocking the filter.

Explanation: In severe cold (-25°C), diesel fuel can gel due to the rapid formation of paraffin wax crystals, which then block the fuel filter and lines, leading to fuel starvation and engine stall.