My furnace and water heater both have gone out a couple of times this week. Usually in the early am. I had the pro out and he told me it was a clogged air filter. This morning I lit the pilot, when I turned on the main burner it fired for about a half a second and went out taking the pilot with it. Question is-do the gas valves in the furnace and water heater shut down if the line pressure is above a pre-determined limit? I am thinking the Regulator at the meter may be at fault.