Which of the following actions can contribute to vehicle fires caused by improper fueling?

Each of the actions listed can significantly increase the risk of vehicle fires stemming from improper fueling.

Using the wrong fuel type can create issues such as engine overheating or fuel system damage, which might lead to leaks or malfunctions. These conditions could ignite and lead to a fire, particularly if the vehicle is operating under heavy loads or high temperatures.

Pumping fuel too quickly can cause static electricity buildup. If a spark occurs at the wrong moment, it can ignite fuel vapors, presenting a serious fire hazard during refueling.

Neglecting to turn off the engine while refueling is another dangerous practice. An operating engine can generate heat and fuel system pressures, making the situation more volatile. An electrical system running could also present additional ignition sources.

Thus, all these actions contribute to potential fire hazards, making it crucial to follow proper fueling procedures to mitigate these risks effectively.