If you MUST keep the gas tank. Pull it out and clean as well as you can. Clear the lines, all of them. And clean the Carb. Put a filter some where between the tank and the pump. Put another between the pump and the Carb. And if there is still crud in the tank you can get by with a bit of metal screen rolled into a tube and pushed into the the outlet line until it sticks up inside the tank. Sot of a way to keep from clogging the outlet. Let us know how it works.
