Looking for advice. 1984 Sportcraft, 228 mercruiser. Boat stopped dead in the water after running fine. Water separator had quite a bit of water in it. Changed separator and carb filter, got boat running again. This happened twice. I drained the entire tank and cleaned out what I could. Filled it around half full with gas, (From the gas station, I assume E10 ethanol.) Boat ran fine for about an hour, sat for 5 days. They took it out yesterday and it failed again. Same issue, separator full of water. Any ideas would be appreciated.