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Apparently, Weber does not make a conversion kit to convert the grill from propane or from natural gas to propane. According to the Owners Manual - "Liquid propane gas is not natural gas. The conversion or attempted use of natural gas in a liquid propane unit or liquid propane gas in a natural gas unit is dangerous and will void your warranty." (From Page # 3 of the Owners Manual)
It is probably legal for you to perform work, check local codes or call local gas company first. If you've never worked on a gasline before, I'd recommend a professional to either assist you or hire. You don't want to chance a potentially dangerous or costly mistake. And when I say pro, I don't mean the guy in the plumbing dept. of the hardware store. I'm recommending a fireplace/ grill shop or asking your gas company if they provide this service. Good Luck, but play it safe on this one.
Most major hardware stores that sell grills have a universal conversion quick connect hose and gas line adapter fitting. That.. you can probably handle. Next you need to install a quick connect adapter from the house gas line or meter (unless one is already there for you). Otherwise you may want to call your local gas company or fireplace/grill store to send someone out.
Last all LP to NG conversions require the orifices on the back of your grill's valves to be changed to larger holes. (LP has more pressure thus small holes and NG must be larger.) The trick is getting the precise numbered drill bit diameter(45-55) for your particular grill. You can look on your manufacturers web site to provide this info. Often times they can sell you a new set of orifices, predrilled, to the exact diameter for conversion. Drilling out orifices is usually cheaper and pretty easy if you know where to find the bits (internet or specialty tool store). Sometimes your local gas company or fireplace/grill shop will provide this service as well.
Hope this helps, and good luck.
You may have a problem with the flame sensing capillary. It may need to be replaced, or it may need to be positioned into the pilot flame better, or you may need a new gas safety valve. Sometime there is an adjustment screw for the pilot which can make the flame bigger or smaller. If will be on the safety valve.