What is the danger caused by fueling the vehicle while its engine is running?
- There is no danger in keeping the engine running during vehicle fueling.
- Correct answer: Combustion of fuel fumes by a spark.
- When the engine is kept running, fuel consumption is increased.
- Engine overheating might flare-up the fuel.
Why this is the answer
The correct answer in the official bank: Combustion of fuel fumes by a spark.
While fueling, flammable fuel fumes gather around the filler opening. A running engine and the vehicle's electrical system can produce a spark that ignites these fumes and starts a fire. That is why the engine must be switched off before fueling, and smoking or any open flame is forbidden at the station. Extra fuel consumption is not the real danger.