I have a 84' mercury and I put a used power head on last year and I can't seam to get it to run right. It runs great some times but only for a little while and then it's like it has a clog in the fuel line. i changed the hose from the tank and changed the ball. Checked for water in the tank, had the carburators rebult, changed the wires and plugs, cleaned the screen where the gas comes into the motor. I even took the screen out and tryed it like that but still no results .... I don't know what else to do ... I have had a boat machnic look at it and he can't seem to find any thing either,... Any suggestion...?
