LRA Tank sending unit no longer reading Empty. (1 Viewer)

[Fisher23]

My Aux Tank control unit no longer will show Empty.

AT first I thought the sending unit float might be stuck, but that's not the case.

I emptied the tank, removed the drain plug and put a bore sight in there, and one can see the sending unit float ball is on the floor of the tank.

(see Attached)

It there a way to adjust the controllers resistance reading to match the float?

 

[Fisher23]

The controller reads as follows:

 

[MikeDeadly]

I'm very intermittently having the same issue. If I'm reading the manual correctly, as resistance DECREASES the gauge reads a lower fuel level. Since the gauge is resistance-based my plan was to check all the wiring connections to see if something has happened that would add resistance and not let the gauge read fully empty. The only bummer is this will likely require dropping the tank. I just dug out the manual for the gauge and there is no mention of calibrating/adjusting the controller or the sending unit though...