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Sorry for the delay in getting to your question, but I just noticed it when I got up to put wood on the fire.............. This is normal when the gas line has been evacuated completely. You can smell some gas, but it won't be fully equalized and the air out until you run it some. Keep trying to ignite it and when it lights leave it run for a few minutes. If you have any yellow or orange in the flame tips when the burner is on high, the LP working pressure may be too low and need to be adjusted up at the tank regulator. Have that checked with a manometer. Have it set at 12 WCI which is just right with an allowance for 35K btu use. IF you don't have an adjustable regulator, you may need to have it replaced. Marshall makes a good one. Hope that helps here. Please get back to me if you need more as all follow ups are included in our fee.
It takes some time to get the air out with such a small orofice. Keep trying and it will work itself out.