I have a 9.9 four stroke Mercury outboard that acted like it got something caught in the lower jet. So we have had it apart clean an back together an it still acts the same way. itll run as long as we pour fuel into the carb, but it doesn't want to suck any new gas into the carb. we've replaced the check valve also. Im lost? It originally start acting it didn't want to pull gas out of the tank but I could pump the bulb on the tank a bit and it would continue to run fine. My prime bulb feels a little awkward also. Any ideas?

Serial Number?