A new gremlin popped up this past week while on the boat. I have a Universal M25 with a Facet fuel pump. Normally, when I turn the key, the pump clicks approximately once a second while the glow plugs warm up. This time however, when I turn the key, the pump clicks very rapidly for a second or two, then settles in to it's once a second rhythm. The engine fires right up but I'm concerned about the rapid clicking. Any thoughts? Full disclosure: I have not replaced the filter inside the pump recently. I have it, I just need to install it.