I have a 2007 Horizon 240 w/Mercruiser 350 MAG MPI.
It generally performs pretty well, gets up to about 50 mph and the engine sounds smooth.
Occasionally, however, it will lose power and suddenly I can only go about 30 mph or so. When this happens, if I stop and try to get back up on a plane again, the engine feels weak and even sounds like it's misfiring if I give it too much gas. If I wait a while it seems to be okay again, at least for a while.
Thinking fuel might be bad, I ran it down to 1/8 of a tank, then added a bottle of fuel enzyme stuff and filled it back up with premium. It seems a bit better, I think, but the problem still does happen occasionally.
I also replaced ~part~ of the fuel filter. This is the GEN 3 Cool Fuel module -- it has a cylindrical filter element, which I replaced, and a flat disc filter that I don't really know how to replace. I tried pulling on it with needle nose pliers but I'm scared I'm going to break something. This is what the filters look like:
http://www.ebay.com/itm/Mercruiser-Mercury-Gen-3-Cool-Fuel-Module-Filter-Kit-35-866171a01-35-892665-/141481128133So my questions are:
1. How do I replace the flat disc filter?
2. Do you think replacing this filter will help?
3. Could this still just be bad gas?
4. Does this sound like a different problem altogether?