gravelman here..not sure how small a "tractor" we are allowed to talk about here but i have a 2014 Simplicity ride on mower with a Briggs and Stratton 18 hp engine. It will start and run but only for a short time. I changed fuel filter, same thing. I see a small black plastic item, must be fuel pump?? with 3 lines in/out of it. Could it be this?? Any guidance much appreciated.