I have an extra sending unit and got to thinking about this the other day so I got the trusty multi-meter out to verify. 30 ohms resistance is in the full float position. If you look at the "Gauge Shows Full at All Times" section, #2 shows a broken wire which would be no current.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.