72 Duster with a Rusty fuel system....how do I avoid this???

Well, spank my monkey....
I went ahead and ordered the tank and sending unit. $120 shipped. I guess I'd better order now before they get more expensive from any Chinese tariffs that might be coming!
Sender is a 3/8" with a 1/4" vent nipple.
Even though this is for my Brother In Laws car, this does me a favor because the car should reliably start each time when I need to move it.
Back to the topic of avoiding fuel contamination.....Is a full tank better than one with only a few gallons? I wonder about condensation. Probably a non-issue though with a new tank or a coated one. My 67 Dart never seems to have trouble with the original unrusty tank. My 70 Charger is fine with the replacement tank from 2001.