Test to verify power is off before continuing. Shut off fuel supply (often found between the outlet of the tank and the filter).
Many times, the easiest point and method to disconnect is by unbolting the fuel pump cover from the furnace motor itself. Gently move it out of the way, while trying not to disturb the fuel lines any more than necessary. This minimizes the chances of kinking lines or disrupting the mating surfaces between flared ends of the lines and compression fittings. Remove and (clean or) have a replacement filter ready to install when reassembling later.
Clean up any addition debris and put in the trash bag. Close up the bag tightly and remove it from the work area.
