Jung did not include the J/P dichotomy in his system, at the contrary of MBTI. In the MBTI system, that dichotomy tell if you prefer Perception or Judgement in the external world. Fe-dom; ESFJ and ENFJ, prefer judgement in the external world, and their judgement are based on feelings. So this is external, and feeling: Fe. They are extrovert, so, that function is their dominant function. Fi-dom, them, ISFP and INFP, prefer to use Perception in the external world, and their perception function is Se or Ne. But being introvert, theses extrovert functionx are auxillary and their dominant function is Fi. So, that mean that Fi-dom don't want to take decisions too much quickly and still aloof, prefer to take informations before making decisions. But they take theses information in the external world and so take care of opinions of others. And ultimately, Fi users are concernes with harmony, caring, consensus, etc, just like Fe users.
"guts" about what is right and wrong are F things, not necessarly Fe or Fi.
As I explained, Jung functions alone were inferiors to MBTI, which improve and rationalize the initial theory.