Riding Mower. - Won't start / hard to start: Totally dead - nothing happens; Can't remember; Ran it until it was empty. - Starts then stalls or dies: Not sure; Sometimes. - Smoking: White or blue smoke; Oil looks fine / full. - Urgency: Within a couple weeks. - Note: Had guy work on it over summer. Replaced fuel pump. Installed carburetor that's when it went down. Now won't start at all. I think battery was new this spring. Did run early summer but suddenly would stop.