Hey guys been working on fixing my issue of my fuel gauge reading empty. I replaced the sending unit and fuel pump in the rear tank because the pump and sender were both bad and I have yet to replace the sender in the front tank. Now that I have replaced the sender in the rear I can switch tanks and the gauge will move but it will only go from empty to maybe 1/6 of a tank even with the sender float at full. Is there a known issue with the fuel gauge going out or should I just replace the sender in the front tank and see if it has the same issue. I've double checked all the wiring and I wired it correctly. Any help is appreciated or if anyone knows a way i can double check the sender to make sure I didnt get a lemon.

 

Alright guys both senders have been replaced and now the front tank is reading about 1/8 of a tank and its nearly full while the rear is reading about the same. There is movement when switching tanks its just delayed and not much at all. Could this be a grounding issue or is it just the fuel gauge?

 

With both of them doing it, I'd be looking at wiring of course, but maybe the switch or gauge.

 

The switch is fine Im just not sure of how to test the gauge...