Guys, I'm new to the forum. Here is my issue. I have a 1987 ProV 150 on a same year Ranger bass boat. The boat is equipped with twin 14 gallon fuel tanks. When i run for a period of time (about 7-10 miles) @ 4500-4800 rpm, the ball will suck in tight and obviously starve the motor of fuel. When i come off plane I can jump back and turn the fuel tank switch and the ball comes back and it will run normally. The other tank will do the same thing. According to the gauge it seems to happen right when the tank gets to 1/2. The fill vents seem to work fine when I overfill the tanks. I have replaced the fuel line from the tank switch to the motor with new ball, line and connector and that did not fix the problem. Any ideas??