I have a question about a 2000 opti. 135 saltwater. The warning buzzer went off after running motor for half an hour. solid constant beep. Then took me down to idle. I do not have warning lights just audible buzzer. So far the checks i have done the float in the tank on the motor shows it is bad. But as far as i can get out of my manual it should be 4 beeps and off 2 min. then 4 more beeps. The float switch tests good. And my merc. dealer says he is waiting on 2 tanks for boats at his place now. It must be a common problem.I was at the lake 2 weeks ago and had no problems for 2 hours. And then solid beep i stpped the motor and removed the switch on the motor tank and then i got 4 beeps then off 2 min. What do you think do i have a bad float and and over heating problem.Last weekend i replaced the tank and float and switch.i have not had it to the water yet. i have another question about water pressure i do not have a guage but my manual says i have a hose on my motor that is not used. is it the small grey tube with a red stem in the end? it comes from the motor and ends in the well next to the fuel bulb. THANKS!!