Gas leak at sending unit

Yep, jackstands on the frame, so the rear axle drops down. Should allow you enough room to at least try to tighten the sending unit. Try using a chisel/hammer and smack the sender to maybe get another 1/4" or so turn.....

I know you're asking about removing it, but IIRC you already put in a new unit. I bet it's just a tad loose.