Propane generator will not start without starting fluid

I don't know squat about that generator but it's evident it isn't getting the correct fuel-air mixture to start. Is there a butterfly plate in the throttle body that would act as a "choke"? Also, ISTR that propane fueled engines may have a valve that allows higher propane delivery for starting.

For more focused advice, list the model and year made. Some of the really good generator techs will only respond with that info.