It could also have a leak in the float, causing it to sink.
But it reads full when he fills up.
Ryan, when you did the resistance test was the sender out of the car? If so, turn the sender over and try again. I have had some where the wiper on the potentiometer would lose contact with the wire wound resistance unit. This can be retensioned.
I can't say that I have found a "quality" reproduction one.
nassi is right, they are the luck of the draw. Fuel senders are the bain of my build so far. I've been through four of them, plastic or brass floats make no difference.
I recommend buying two of them if you are to replace the current one. Watch out for the seal of the sending unit wire. It fails and leaks, two I had leak there. Check the float in a bucket of water prior to putting it in (and let it dry).
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