The eBay fuel sender description says w/o low fuel light. My fuel sender has a metal bulb attached to it with a wire going to the two wire connector. The bulb is attached to the sender via a heavy wire which also provides the ground. The 323 sender does not have this bulb. I assumed this was for the low level light.
Jack Byrd
You are correct, the float(metal bulb) is a low level switch. When the fuel level goes below the float, it disconnects the ground from the sender. The gauge with a low level light would sense the open circuit and then turn the light on.
The standard BF323 had no low level light, while the GT did.
According to the moderncapripart website, they offer a sender with the float and a slightly cheaper but still overpriced alternative without.
The first thing I would do is jumper the yellow wire(sender unit’s output signal), located under the seat that goes into the fuel sender assembly to ground. After you ground out this wire, turn the ignition switch on and you should see the fuel gauge max out.
If the gauge maxes out, then you’ll know the signal wire and the gauge itself are working.