Could also be the amount of air getting into each burner. There should be a metal ring with holes on the front of each burner. There should be a set screw to keep it from turning by it self. Loosen the screw and turn the ring until the flame burns better and tighten the screw back again. If the orfice is the wrong size for the gas you have, it might be able to be drilled out or needs replaced if it needs to be smaller. You will need the manual to find out the correct size orfice, it will be a letter size of a drill bit, some what hard to find.
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In addition to my question. The fryer in question is PITCO 65C+
I ahve noticed that the Gas we use is butane and not propane which is the LPG gas used for the calibration of the orifice. My technician tells the yellow flame will not stop unless the orifice is change to the proper size.
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