I follow you now. I know it is an entire assembly as I have replaced several and once already on this truck. You just threw me when you mentioned sending unit...
Because there is no lack of power and no issue at all once it is running, I think the actual problem may be the regulator. However, due to the fact that the float sensor is erratic and not working most of the time, I will likely replace both...
I just wish I could replace the regulator before heading home, I do not want to get stranded.