What is the minimum inside diameter required for fuel fill hose?

The minimum inside diameter required for fuel fill hose is established to ensure efficient transfer of fuel while minimizing the risk of vapor lock and spills. A diameter of 1 1/2 inches is specified in ABYC standards because it provides a balance between flow rate and size compatibility with typical fuel tank fittings. This size allows for rapid fueling while also being manageable for installation and use on a variety of vessels.

Using a hose with this minimum diameter helps to prevent potential blockages and allows for the effective venting of fuel vapor during the filling process, which is crucial for safety and performance. The specified diameter aligns with best practices in boating and marine engineering, taking into consideration the necessary capacity for fuel delivery to meet the demands of most marine applications.