Checked the search and couldnt find a solution 1998 220se port tank is less than a year old installed by me. Starboard tank is appr 3 or so year old rds tank installed by previous owner. I usually run the selector on one tank at a time. Last sat run the river, port tank completely out of fuel with both selector valves open. Would only draw from port tank and would not draw from starbd until turned on the valve for that tank. Sunday run offshore and she runs great. 15 miles out on starbd tank, started with 25+ gallons. Seas not great 2-3' Riding bow up and cruising and fuel guage bouncing around. Halfway in she dies like out of fuel, tank is reading 0 on guage. Switch over to port tank and run back in. Get to intercoastal (smooth), Look and sitting not in rough seas, starbd tank is reading over 1/4 tank like 12.5+ gal of fuel. in Flat water tank guages seem to read correctly. This is not first time it has happened to both tanks. So is it typical in moderate sea's to leave that much fuel in tank from sloshing? That seems to be a lot of unused fuel. Is this the nature of the beast? Do yall typically trim the bow down to conserve usable fuel. Also when it runs out of fuel there is no sputtering or missing....goes from cruise to dead right away. Typical or should look into other problems? Thanks for any advice.