i have been having a problem with my boat and i was hoping someone out there might be able to send me in the right direction. i have a mercury 200hp outboard and i have been losing power at mid to full throttle. the boat runs for quite a while before it gives me any problems, however i have been keeping the throttle at 50%. at full throttle, the problem comes on much faster. the primer bulb is completely sucked in at times right before it conks out. the primer bulb is new and the water seperator filter is also new. the fuel tank vent is clear also. i would appreciate any ideas or suggestions that you may have.