I have a MTD with the above listed engine. If this tractor sets for a week it will not start without starting fluid sprayed in the carb. once started it will start daily with no problem. You can see gas in the fuel filter but it is like the pump is not pumping. I took the pump of if you blow and suck on the inlet side I can fell a small amout of air leaking when you suck on it. On the outlet side air only goes one way. Is the pump going bad and losing its prime or do I have some other problem?