If those senders are original, it's probably time to change them out; especially if you are going through all the work to pull them. I as well as many others here have changed to these; no looking back:Thanks team. I may pull the sender and check it out when I get to Ft Pierce. Since my first post it dropped another 1/4. It’s down to 1/4 now. Then it bounced up to 1/2 for a bit and worked it’s way back down to 1/4. I checked engine room for a fuel flood. Nothing.
https://kus-usa.com/product/sss-ssl-sender/