I own a 1967 9.5 hp Johnson. First time out this year, it wouldn't run while in forward without the choke, and with the choke it only ran shortly before it died. I pulled the carb and float chamber off, they were clean as could be. So I just put new gaskets on them. I also put a new gasket on the fuel pump. I put it all back together, and now the motor won't start at all! It's not even trying to start, I get nothing. Any ideas?