What is the minimum inside diameter for a fuel vent line?

The minimum inside diameter for a fuel vent line is established based on safety and functionality requirements. A diameter of 7/16 inch is specified to ensure that the vent line can accommodate the necessary vapor flow while minimizing the risk of blockage.

Having a vent line that is too small may prevent adequate venting of vapors, leading to pressure build-up in the fuel system. This can create dangerous situations, including potential fuel leaks or even explosions due to pressure not being released. The 7/16 inch diameter strikes a balance, allowing for proper flow rate and preventing issues related to vapor accumulation.

This specific size is often recommended in both industry standards and regulatory guidelines, ensuring that fuel systems operate safely and efficiently. Therefore, it is critical for anyone working with marine fuel systems to adhere to this specification.