I have a Yamaha 4 stroke 115 and would like to add a fuel/water separtor due to the change in the new gas regs. The more people I talk to the more confused I get about the right one. I would not think I would need more than a 30 gph filter but some say get the 60 gph and other say 90 gph. Some say get the drainable filter and some say get the regular one that looks like the oil filter. Does anyone have any suggestion on the type and size filter I would need. Any help would be appreciated.