What must be installed if the fuel distribution line length from tank outlet to engine inlet exceeds 12 ft?

When the fuel distribution line length from the tank outlet to the engine inlet exceeds 12 feet, it is essential to install an auxiliary manual shut-off valve. This requirement is crucial for ensuring safety and allowing for maintenance or emergency shutoff of the fuel supply.

The auxiliary manual shut-off valve provides a means to quickly and effectively stop the flow of fuel in the event of a leak or other emergency. It acts as a safety feature that can be easily accessed by personnel, enabling them to mitigate risks associated with potential fuel leaks, spills, or fires. This is particularly important in long fuel lines, as the increased distance can lead to more potential failure points, and having a means to shut off fuel flow simplifies risk management.

In contrast, other options like an electric pump, pressure regulator, or flexible connectors do not specifically address the safety and control needs mandated by the greater distance of the fuel line from the tank to the engine. An electric pump may assist in fuel delivery over longer distances, while a pressure regulator helps maintain the proper fuel pressure, but neither serves the critical role of providing an immediate means to shut off fuel supply in case of an emergency. Flexible connectors are designed to accommodate movement and reduce strain on the fuel line but do not contribute to safety measures