Should the connection point between multiple vent pipes be lower than the top of the fill pipe opening?

The correct answer is that the connection point between multiple vent pipes should not be lower than the top of the fill pipe opening. This requirement is based on safety standards and protocols designed to prevent the possibility of liquid backing up into the venting system, which could lead to hazardous situations such as spills or overflows.

If the connection point of the vent pipes is lower, it could allow for liquid fuel to enter the venting system, which is counterproductive to the venting purpose. Vents are intended to allow air to freely enter and exit the tank to prevent vacuum or pressure build-up as fuel is added or drawn from the tank. Ensuring that the connection is higher than the fill pipe opening helps maintain proper drainage and function of the venting system, safeguarding both the integrity of the fuel system and the surrounding environment.

This is a common safety measure in installations governed by regulations, helping to ensure compliance with industry standards and practices. Local regulations may have specific requirements but adhering to general safety guidelines helps promote uniform safety measures across various jurisdictions.