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Why does diesel fuel cause starting and stalling problems in extreme cold if it is not winter-treated?
- A.Cold makes diesel expand and overflow
- B.The paraffin wax in diesel can gel and clog fuel filters, starving the engine of fuel
- C.Diesel freezes solid at 40 degrees F in all cases
- D.Cold diesel burns hotter and melts injectors
Correct answer
B. The paraffin wax in diesel can gel and clog fuel filters, starving the engine of fuel
Why
As temperatures fall, wax crystals form in untreated diesel and collect in the filter until fuel flow stops. Using winter-blend or properly treated fuel, and carrying spare filters and anti-gel as directed, prevents most cold-weather fuel shutdowns.
Manual topic: Winter Driving - Fuel · From the General Knowledge practice bank (GK-296).