Model 9D902 Type 2005 I've got a Briggs and Stratton Classic 3.5 motor, on a pushmower. I've replaced the carburator gasket(which I usually have to do about once a year). Anyway, this time it hasn't fixed it. After I prime it, it WILL start, then die, UNLESS I keep hitting the primer button for about 30 seconds. After the repeated priming, it will finally come out of it, and run. Why is it not sucking the gas by itself. I wouldn't mind the priming, but it's for a rental property, so a renter is never gonna figure that out! THANKS!