I wouldn't have bought that -- but I wouldn't worry about the equipment, just keep watching it for signs of water/gunk...AND change it (at least) once a season when you winterize the boat.

I suspect that the first filter (which it is) should be 30 microns and the engine (final) filter should be 5 microns, or so.

You might not change the final filter every season, unless you see something untwart in the initial seperator/filter bowl. IT does have a bowl you can inspect?