My push mower primer does not seem to be pushing fuel into the carb, i called the repair shop and they said that the primer is to push air not fuel. Does this sound right? I have never heard that before. I am asking because there seems to be no reisitence when i push the bulb i took it all apart and cleaned everything and changed the primer bulb but i still have to prime the mower 10-15 times to start it. Anyone have any ideas what is going on here.