I have a 9.9 Yamaha. We put boat in water at docks at mosquito last Fri ran ok. Went up to go out today and it started up and ran real ruff and died and then wouldn't start. I have new gas and primer ball is full took line off to motor and got air out but still won.t start I was going to change the connectors that go on engine and gas tank does anyone know if that could help? Or anyone got any ideas what could be wrong?