I bought a used Four Winns boat last summer and it ran great. I have a 5.0 fi/sx, Volvo Penta engine, 1995. When I took it out for the first time this year it is leaking from the draincock on the manifold. At high speed it's even spraying out of the draincock. That does not seem to be right. Any thoughts on what that might be? Possibly some bad seals? Any help would be greatly appreciated. Thanks 