The practice of leaving some space in a boat’s fuel reservoir is a crucial safety measure. Gasoline, a volatile liquid, expands as its temperature increases. This expansion can be significant, particularly on warm days or when a boat is exposed to direct sunlight. Completely filling the tank leaves no room for this thermal expansion.
The consequences of a full tank subjected to thermal expansion can be substantial. The increased volume of fuel creates pressure within the tank and fuel system. This pressure can lead to fuel spillage through the vent, posing an environmental hazard and a fire risk. Additionally, excessive pressure can damage fuel system components such as hoses, fittings, and even the tank itself, leading to costly repairs and potential engine failure.
