My grand touring's fuel gauge is reading empty regardless of how much fuel is in it. I unplugged the connector on the back of the gauge and there is power to three of the four prongs (I assume the fourth is the ground) so I'm not sure if the gage is broken or if the sender is just sending an empty signal.

Anybody out there experience a similiar problem and/or any thoughts on an easy way of further diagnosis the problem?

Thanks. . . .