If this is the blue filter/water separator, mine is located in the bilge, about 1' from the fuel tank on the port side. You can cut the main fuel line if long enough, and place the filter in-line. All Yamaha 4 strokes come with a fuel filter on the engine from the factory. Usually the dealer who riggs the boat installs the external filter.
thanks guys, do you access it from the battery hatch?