fuel guage 1.9 td estate not hdi s plate

[pjb0150]

guage shows empty orangelight on even though fuel in tank
got sender out lifted float and still no change to guage
just 2 wires to test at sender
anyone know what values i am looking for volts or resistance to test sender

engine management light is on but sureely that cannot be anything to do with it --he says
tia

[pjb0150]

just tested the sender is getting fed by 5.1 v