I have a fc90 and a fs90r, the fc the bulb goes dry and only has air even when I pump it. It doesn't fill-up with fuel like the fs90r. I think this is contributing to hard starting. The fs starts first or second pull while the FC may take up to 15 or so pulls hot or cold. I have done all preventative maintenance and still can't get the fc to start properly. I believe this issue is causing the hard starting, so what is causing it to do this?