I'm using Moeler filters on both my Johnson and my Mercury engines. Both are 10 microns. The Merc is a 1989 and the Johnson is a 1991. Never had any problems with either engine with regards to the fuel. I agree with RWilson2526, the smaller the microns, the better. Just as a general comment, it's been my experience that if you look in stores, most stores stock more 10 micron filters than any other type. Must be a reason.
As far as the catalogs go, unless the filter spins on to a fitting on the engine, or is somehow part of the engine, all filters are for all engines. We're talking about units that bolt to the side of your boat, usually at the splashwell, and filter the fuel as it comes from your tank and before it goes into your engine.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
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