Fuel Gauge not working (1 Viewer)

[CharlesHS]

The last time I was in the PI I noticed that no matter how much fuel I add to the tank; the needle doesn't move more than a 1/8".
I am not sure if the sending unit (83320-69165) in the tank is at fault or the gauge.
My plan it to measure the resistance; then add some fuel and remeasure to see if the resistance has changed.
Hopefully accessing the sending unit connector does not require lowering the tank.
Does anyone know what resistance I should read across the connector pins at empty, half and full?

 

[jblueridge]

Not an answer but applying battery voltage to the gauge should make it read Full.

 

[CharlesHS]

Right now the gauge needle is sitting at approximately 2/3.
If I disconnect the sensor from the gauge harness the needle should drop to zero.
I will read out the voltage coming from the gauge and jump the gauge leads to verify the needle moves to full.