Where is the valve to bleed oil from a furnace hot water system?

The bleeder port on most oil furnaces is located on the front of the fuel pump. This is located to the side of the main burner housing. It will have your oil line attached to it. The bolt is usually a 3/" and has a hole in the center. to bleed you push the reset button and open the port until oil starts coming, then tighten the bolt.