I use the term burner to refer to the consumer of the gas.Not sure what you are referring to. The generator has a demand regulator inside which typically has a window of 10-12" of operating pressure for LP. Nothing else is allowed.
I think you are referring to the primary and secondary pressure regs outside of the unit. There is no "burner" inside of a generator. A demand regulator does not regulate pressure. If establishes the mixture going to the engine.
It is after all, burned...