Start with the fuel filter, if that doesn't do it check filter in tank on end of fuel bowl, there is also a filter in the top of bowl. If still not running correctly check filter at end of hose running to the hand pump at banjo bolt end. Sometimes that fuel hose from the shut off under tank to the hand pump will collapse on the inside when engine warms up, check it. We have any part for your tractor in stock should you need something. Give us a call if we can help.
Ben, Parts manager
Circle G Tractor Sales, Inc.
http://www.circlegtractorparts.com
662-252-5272