Originally Posted by RunkRod
So this cast iron burner won't run at LP even with a LP orifice?
The Metal Fusion burner will run just fine on LP with the correct orifice and gas pressure. You mentioned that you are using a low pressure regulator and a Honeywell solenoid valve. Either or both could be the problem.
Here's the basic scoop on LP gas pressure. Generally, low pressure means 1 psi or less and high pressure is anything above 1 psi. Do you know for sure which type you have? The burner seems to be burning very rich which means it isn't drawing in enough air. This could be due to the lower velocity of the low pressure gas passing through the orifice.
I have one of the same type of Metal Fusion burners and it works well with a 10 psi regulator and a high pressure orifice. Not my favorite burner, but it gets the job done.