I have a 96 Evinrude, 115hp, that has just been completely rebuilt. I think the only fuel filter that I have is an in line filter, that is located just before the fuel pump. I have been reading about the water/fuel separators, for outboards. My question is, do I really need to install one of these filters? If so, should it be installed past the primer bulb? If one of these filters is installed, should the in line filter be removed?