I have a Lennox VFGL-18 that was installed when my house was built 2 years ago. The installation stopped at the gas line which protruded from the house. I have no city gas, so I bought a 100lb propane tank, single stage regulator, hose and connectors, and tied it all together today. I cannot get the pilot light to light. I know I have to bleed the air out of the line. After holding the primer knob in for 15 minutes, still nothing. There is spark from the piesto ignition. The external shut off valve is on. The only variable on the log that I can't account for is an on/off switch on the base of the log. I don't think it has any impact on igniting the pilot, but tried it in both positions. I think it is just for regular flame operation, and is connected to a wall switch. I don't think the gas line is clogged, since the external components are new, and the existing line that runs in the house was taped over. So I don't think any critters moved in there. It is cold today - in the mid 20's - so not sure if that has an impact on the pressure or the regulator. Should I hear anything coming out of the pilot light nozzle? I currently don't. Can someone give me any hints before I self combust?