Water in tank?

[MIAcanes44]

The other weekend i was trying to put gas in my tank and it acted like it was full it kept spewing out. It finally just released and acted like it burped then i was able to put gas in it. Well the next weekend i took my boat out and ran out for about 30 mins and it ran fine. i stopped for about 20 mins and when i went to move the motor acted like it didnt want to run. Almost like a fouled plug. Everytime i put it in gear it stalled out. I ran the motor in idle for about 5 min and kept giving it throttle on the motor. It finally cleared out and was able to get back. well i took my water seperator filter off and poured it in a glass and it was half full of water. i then took some gas out directly out of the tank and it had about 3% water in the glass. is my tank cracked and leaking? should i just empty tank and fill up again and see what it does? what are my alternatives and what should i do? I cant take the tank out and dont really want to put it in the shop.

[FUTCHCAIRO]

SOUNDS LIKE YOU BEEN USING ETHANOL GAS. DRAIN TANK AND FILL AGAIN, KEEP CLOSE CHECK ON YOUR WATER SEPARATOR.
PA THE OLD MAN OF THE SEA SEMPER FI

[MIAcanes44]

ok thanks. I have about 25 gallons of gas in there. any idea on where i can dipose that?