Check your engine manual, it will tell you what micron filter that your engine requires. Also check with the filter manufacturer, most filters to work
properly have a set gph in fuel
used, this creates a swirl action in the filters to properly separate solids to drop to the bottom of the filter. I've inspected 1000's of small sailboats, the standard filter used is 500 Racors, way over sized for the application. My guess, the reason they work
so good, is the fuel consumption
is so slow, maybe 1/2 gph instead of 20 or 30, that any solids fall out of suspension, long before they get to the filter chamber. My boat
personally, install a vacuum gage, tells you long before a fuel filter
clog, and I would use a minimum of 10 micron unless your engine specs call for a 2 micron. Using 30 is like using a screen
Hope this helps, great sailing all. Capt.Vince Rakstis, RetMS St.Petersburg, Fl.