i have a mariner 200 efi outboard when the engines is turned off it is leeking 2 stroke oil from the exhaust system and drips out to the gearbox when trimmed.is this the oil pump or just a valve some where that need replacing,it smokes like alot when started i have a five galleon autolube tank fixed to the hull that feeds the smaller header tank that is fixed to the side of the engine.any help would be appreciated.