My neighbor converted his propane grill to natural gas, drilling out the
orifices. It took a while to dial in the correct heat output on the burners
due to the operating pressures of each fuel and the energy content. He
continued to open up the orifices until the burners fired correctly. You
may not have sufficient pressure on your natural gas line. Here are your
variables.
Propane contains about twice the energy in a given volume of gas.
Propane normally works at about 11 inches of water column.
Natural gas "typically" runs at around 7 inches of water column.
I'd check your natural gas pressure (with burners lit) and insure it meets
the requirements of the grill. Alternatively, you could light one burner,
note the flame size, then light the other four and see if the first one gets
smaller, but a pressure test is the best.
Jack
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