I had the dealer put a filter on my 225 ETEC HO, a few weeks ago. After they put it in, the gas ball wouldn't stay hard. I pulled the gas bulb and replace it, pumped it up, point up in the air 20 times or so to clear air out completely. Re-attached. Same thing again, ball would get weak, boat seem to run fine but I have heard that I could burn the motor up with this happening. So I pulled the lines off the filter and hooked up directly again and the problem went away, ball stays hard again. Any suggestions for the reason that when connected to fuel/water filter the ball will not stay hard? I checked all the connections and they were tight. Only thing that I can figure out is that the fuel/water filter and assembly is Mercury. Looking for suggestions and what is the best filter system out there. Thanks, Les Ems, Maverick Pro Guide Service,