I have a gravley wb with 15 kawi. Some Ahole put sugar in my gas tank. the filter i think caught alot of the sugar. I cleaned tank and put new fuel line and pump, however today it kept dying on me. I would open the choke all the way to keep the mower just running,but it eventually died. What should i do? It seems to act like when my redmax weedeaters get carbon buildup. Do i need to clean out the carbon and how do i do that.