Where is the dump valve located in a fuel system?

The dump valve's primary purpose in a fuel system is to safely release fuel from the system, often in the event of an overpressure situation or to allow for maintenance procedures without needing to drain the entire system. Placing the dump valve at the lowest point in the fuel manifold ensures that any accumulated fuel can be effectively removed. This location allows gravity to assist in the draining process, making it efficient and preventing any potential for trapped fuel in the lines.

In this context, having the dump valve at the lowest point optimizes its function by enabling complete drainage and minimizing the risk of residual fuel remaining in the system. This is particularly important for safety and cleanliness in fuel management.

The other locations suggested, such as at the fuel tank, may not facilitate effective drainage due to the potential for trapped fuel higher in the system. Similarly, the highest point in the fuel line would also hinder the ability to completely empty the line, given that fuel naturally settles at lower elevations. Placing the valve next to the fuel pump may seem practical, but it could complicate maintenance procedures and does not take advantage of gravity in the same way as having it at the lowest point does.