Final answer:
When fueling, it is important to ensure that the nozzle of the fuel pump makes contact with the fuel tank opening to prevent static spark. This is necessary because gasoline is highly flammable and can ignite when exposed to a spark or flame.
Step-by-step explanation:
When fueling, it is important to ensure that the nozzle of the fuel pump makes contact with the fuel tank opening to prevent static spark. This is necessary because gasoline is highly flammable and can ignite when exposed to a spark or flame. Static electricity can be generated during the fueling process due to the friction between the flowing gasoline and the materials involved, such as the nozzle, fuel tank opening, and the vehicle's body.
The static electricity buildup can be discharged through the grounding mechanism present in the fueling system. By making contact between the nozzle and the fuel tank opening, the charges are safely discharged, reducing the risk of a static spark igniting the gasoline. This is particularly important in situations where the environment is dry or if there are potential sources of ignition nearby.
For example, imagine if a static spark were to occur during fueling without proper grounding. The spark could potentially ignite the gasoline vapors present around the fuel tank opening, leading to a fire or explosion. By making certain that the nozzle is in contact with the fuel tank opening, you are helping to ensure a safe fueling process and minimizing the risk of accidents.