When I built my first jet, I asked my mentor the same exact question. His answer was: "Do you want it to stay on?"
After giving it a little thought and having come from the N-Plant Biz, I recalled that for critical stuff one never depends on a single failure mechanism. For example, that is why we have two batteries for the Rxers, etc. For a connection like a fuel line, there are the barbs and the wire ties, thus eliminating the potential single point of failure!
So I ask you: Do you want it to stay on? :-)