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There should be a screw or stud right on the sender flange. That is the actual part you need to ground. I know, you don't want to drop the tank, but.....
I don'r remember if you can reach the sender with the tank "up" but you might be able to clamp a ground wire onto the fuel pickup stub before it enters the jumper hose to the main fuel line.
You should be able (with a friend) reach up there with a clip lead and ground it by hand to see if you are on the right track.
You should be able to check the hot circuit by grounding the lead to the sender and getting a large gauge swing.
Then, of course, there's always the possibility that the sender itself is bad or stuck on empty
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