What should you do while fueling a boat to avoid spills?

Using the nozzle in contact with the tank opening while fueling a boat is the correct practice to avoid spills. This technique helps to create a steady flow of fuel directly into the tank, minimizing the risk of overflow or splashing. When the nozzle is in contact with the tank opening, it can also help to reduce the chances of static electricity build-up, which can be a fire hazard. Additionally, it allows for better control over the fueling process and helps the person fueling gauge when the tank is nearing its full capacity, thereby preventing overfilling.

In contrast, filling the tank quickly can lead to spills and is generally discouraged since it reduces the ability to monitor the fill level. Leaving the fuel cap off until finished poses a significant risk of spills and exposes the fuel system to contaminants. Filling the tank to the brim can cause fuel to overflow due to expansion or turbulence, increasing the risk of spillage. Therefore, maintaining contact with the tank during the fueling process is the safest and most effective method to prevent spills.