Got a 2.4L 2004 Hyundai Sonata base model. I have tried 3 entirely different NEW complete fuel pumps (the entire drop-in assembly with the sending unit, and float, strainer, and all) and the fuel gauge is still constantly showing empty. Also have replaced the fuel pump/ECM relay. The car runs fine, we just have to monitor our miles for fill-ups. It's obviously got to be a problem in the wiring or the gauge itself (yet all other gauges work fine). The only DTC code I have is a TPS malfunction, which I'm about to replace. Can someone please tell me a good way to test the wiring or the gauges to narrow down the problem? Thanks!