Hey guys, I can't seem to get fuel to go down my gas tank without me having to blow air into it. If I leave it the "on" or "res" nothing goes down so I tried blowing in the tank and voila' gas flows, is there a reason for this besides it being clogged dirty etc.? The tank did flow fuel fine before. Also I recently reinstalled the carbs after cleaning them and am having trouble with the idle and the rpms, I have tried adjusting the throttle nut and that seems to affect the rpms but I cannot get it to stay steady and when it does when I give it gas the rpms go up or stagger a little then go down very slowly as if it stays in the rpms too long going down. Does anyone have any suggestions? Does the black spring screw type thing on the bottom of the carbs have anything to do with it? I tried playing with it but did not notice a change.