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fuel2 shows the schematic.
the fuel sender unit has 3 wires.
br/ws - brown/white - chassis earth
vi/sw - purple/black - signal to dash panel J285
vi - purple - 5v refernce
you can see that there is a join in the cable under the front seats (T6b - 6pin red connector)
you should be able to test the sender and wire from that point.
the sensor has a ground and 2 wires that run back direct to the front dash clocks via the red connector block under the front seat.
VCDS should give you a fault code relating to a wire short/open etc or a level sensor - out of range etc?
or just test at the red block for the signal and reference voltage . . . . . or shorts/opens.
there is no fuse as such for the sender unit as its fred directly from the dash clocks (which will have a separate fuse)
the fuel lift pump and relay are fused seperately - but thats a different issue, not yours
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