I have an 87 black max 175 and was wondering if it would be a good idea to install a fuel/water separator? I have a marpac fuel/water separator that I never installed on my old boat. It is the screw on type with stainless steel mount. Also I premix oil 50:1 into the tank? On the filter there is 4 ports for hoses? what is the proper way to install the lines on the filter? any help is much appreciated.