I bought a truck with a fuel cell and an Auto Meter Ultra Lite fuel gauge. When I bought it, the fuel gauge wasn't working (it always showed below empty). I checked all of the connections and the gauge looked hooked up correctly but the sending unit on the fuel cell wasn't grounded. I grounded it to the frame and then the gauge showed 3/4 full which wasn't right as it was really only 1/2 full. So I drove it down to a 1/4 tank but the gauge still showed 3/4.
Thinking it was the sending until I replaced it with a Summit replacement (the fuel cell is also by Summit). Now this showed the tank as empty which is what the tank was so I thought it was working. However, when I filled the tank up I still get an empty reading and the gauge doesn't change. The needle does come up off of where it rests when I turn it on so I know it has power.
Currently, the fuel gauge has a wire connected to the sending unit, a power wire hooked up to the ignition, and a ground going to the firewall. The sending unit is grounded to the bed frame and of course has the wire to the gauge.
Does anyone have any advice? I am lost on getting this gauge working.