When your Yardman lawn mower isn't running the greatest and keeps dying like it isn't getting gas to the engine, then it is a safe bet that the carburetor needs cleaning or the fuel filter needs replacing as it is clogged. The fuel filter for a Yardman lawn mower will cost you under $5, so it is a cheap replacement and fix to your mower gas troubles either way.
Locate the gas tank on your Yardman lawn mower.
Look under the gas tank for the gas line connected to the base of it.
Follow the gas line to the side of the carburetor. In the center of the gas line, the fuel filter will be clamped into place.
Squeeze and slide the clamps away from the fuel filter. Pull out the fuel filter from the center of the gas line.