I have a 21" Toro 20036 Personal Pace Super Recycler. I got this used and when I put gas in it, the gas slowly drips from under tank. When I push the primer bulb it just feels like air. Won't start. I am a newbie and trying to learn this stuff so please anything will help. I tried googling but couldn't really find an answer. I am thinking it isn't a cracked gas tank because it would still start if it was, right. could it be the fuel filter? It worked at the end of last season without leaks. I need to learn, please help.