What is the first step in properly shutting down a fuel system?

The first step in properly shutting down a fuel system is to disconnect power. This step is crucial because it ensures that there is no electrical energy flowing to the system, which can prevent accidents or unintended operation during the shutdown process. By cutting off the power, the risk of sparking or starting pumps inadvertently is minimized, creating a safer environment for the subsequent steps in shutting down the fuel system.

Following this, other actions such as closing valves, draining lines, and inspecting tanks can be executed, but safely disconnecting power serves as an essential prerequisite. Without first addressing the power supply, other shutdown processes may pose safety risks, especially if fuel pumps or other electrically operated components are active.