i replaced fuel pump last year .found out it was crank sensor when hit brakes on 2004 Hyundai Santa Fe

hard and below half tank gas wold die out .so i put old pump back in now fuel gauge wont work and low fuel light on .checked wires had in out 1o times cant fine anything wrong wiring all hooked up

2 answers
you may have damage the sending unit assm.
You need to put a new assy. back in.