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Is this a new issue ? Most electric fuel pumps are pushers, not pullers, and need to be mounted close to fuel supply to operate properly.
Why do you have to drop/lower tank to remove sending unit ? Is it not stock ? I have replaced the sending unit in my '67 Belvedere a couple times...
You clip that in your tailpipe and it actually gets hot enough to react properly ?? I could see on an open header.