2013 chrysler 200 touring
 

I have a 2013 chrysler 200 touring, been having trouble with my fuel delivery system. My check engine light comes on and the error says my fuel delivery system, I replaced the fuel pump and the fuel gauge still don't accurately measure the correct fuel level, and the check engine light comes on and goes off when I fill up my tank, do I have to replace the fuel harness, I'm confused.