I have an Appalachian Vent free Fireplace and I can't get the pilot to light. I have replaced the pilot assembly and taken all the logs out and cleaned it thoroghly with my vacuum. I have checked my gas, even changed the regulator on the LP tank, still no PILOT. I can only find one way to make it light. I can cover one of the 2 holes that is on the orifice behind the pilot assembly (i assume this is ODS?) Seems this is where the pilot gets oxygen. When I reduce the amount of oxygen (by covering a hole) the pilot lights. Please help, I don't know what else to do!