I have a 1990 Starcraft (Heritage 1600) 16 ft. open bow. I have an in boat gas tank, but don't know where to put the fuel? There are two plastic caps on the aft decking and one is for the emergency fuel shut off as it is printed on the cover. The other cover doesn't have anything printed on it. Could this be where the fuel is added? In addition, does anyone know where the fuel water seperator is?