What is a consequence of overfilling a fuel tank?

Overfilling a fuel tank can pose significant consequences, one of the most critical being the risk of spillage and contamination. When a fuel tank is filled beyond its designed capacity, the fuel has no designated space to expand. This can lead to fuel leaking out of the tank and onto the ground, particularly if the vehicle is in motion or the temperature changes, causing the fuel to expand. This spillage not only creates a safety hazard, particularly due to the flammable nature of fuel, but it also risks environmental contamination.

Fuel that spills onto soil or water can introduce hazardous substances into the ecosystem, harming wildlife and possibly entering water supplies, which can have serious repercussions for public health. Thus, understanding the importance of not overfilling a fuel tank is crucial for maintaining safety and environmental integrity.