To drain the fuel from your Ryobi 3200 PSI 23 GPM Cold Water 196cc Kohler Gas Pressure Washer, follow these steps: Turn off the engine and let it cool down. Locate the fuel valve (usually found near the fuel tank). Open the fuel valve to allow the fuel to flow out into a suitable container. Remove the fuel cap and tilt the pressure washer to help drain any remaining fuel. Dispose of the fuel properly according to local regulations.