I'm all for fixing vs replacing if possible.
If you could provide a list of snap on filters, (The filter does not come off/come apart) with brands, part #'s, etc would be helpful
Specific model and again part #'s for pumps etc would be a big help as well.
**In ALL the above cases, IF the filter gets clogged up from rust, your either repairing it or replacing it, period.
Plus you still have to address the tank inside rust itself..
I'd rather have a good tank where I'm NOT dealing/worried about the pump failing, is there rust in there, how bad/dirty IS the pump filter..
The Op asked in post #5 IF RUST in the tank affects fueling... I think we both agree, yes, eventually it will..
If you can post those specific brand, model #'s, etc for the pump and filters, please do so so I can save them for later posts. (I'm assuming their plug and play, no hacking, return line change overs, etc)..