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I have a question if anyone can help me out. I just purchased this boat two weeks ago. It has a 2010 Yamaha 115tlr 4 stroke efi. I went to clean out my vst tank and noticed I have two vacuum lines that run to a t fitting. On the other end of the fitting it is not connected to anything. On parts diagrams it shows there is supposed to be a pressure relief valve which then connects to the air intake silencer I believe. In the manuals it just says vent hose. Is the relief valve a must have? It appears to be a one way check valve but costs about 120 for it. Any feedback will be appreciated.