Hello. The fuel line in this boat is having a problem keeping prime. As I was tracing the line back to the tank, I came across a small plastic piece that may have been the problem. As it grabbed it, NOT pulled on it, the nipple broke off. It may have been cracked and I just helped it along. Anyway, I have had zero luck finding what this piece is or what its purpose is. I am thinking maybe it switches the main fuel line in the tank to the reserve. Any help?