I work at a boat rental facility on Puget Sound (Saltwater) We have several wooden boats with various outboard motors.We launch the boats from a rocky beach. We regularly flush with fresh water after every use to maintain the cooling system. Never the less we are getting lots of salt deposits in our carburetors which requires them to be disassembled and flushed with carb cleaner regularly. We use sea foam to no prevail. Typically the culprit is saltwater getting into the gas system which could very well be true but, checking the gas there is no apparent evidence of salt water in gas tanks or the gas it's self. Now the question is raised could the saltwater be infiltrating via the carburetor intake port, there are no air filters per say, just plastic covers. Of course the cowlings are properly in place so first thought it would be unlikely a source of contamination but, in these rough circumstances I think it may be a problem. Has anyone else noticed water entering the gas systems on outboards via the intake port? I'm going to place coffee filters in the plastic vents as an experiments. I also am considering putting permanent Water separator filters in all the boats gas systems. Thanks for any input and experiences others may have had.