I have a 2004 90 two stroke Yamaha. 18 gal. built in tank. My problem is at full throttle after about 10 minutes of running, the motor will die.....The fuel line 'primer bulb' will be vapor locked. I will have to disconnect the suction side of the bulb to release air. BUT i can run at around 4200 rpm with no problem. Only at full throttle i have this problem.....Any suggestions?
Note: I have replaced all the fuel lines, filter, fuel pump & new bulb but no change. I even checked the pick up tube, but looks ok?