I understand the flower POT and my tank has been drained a couple of times. What I am looking to accomplish is preservation for storage and rust in the tank. I looked at a tank r nu but there weren't any on the west coast I located. My understanding rather than boil out they cut in half and "seal" and weld shut, keeping all flower pot etc passages open? Coating might not be the correct term.
The car doesn't get driven much and is an example in March of 80 approx 53K miles currently 62K miles. So I would be happy to hear of other alternatives.
Well, my first comment is that if isn't broke, don't fix it. If you have a rust situation in the tank, or if you have a lacquer situation in the tank, then those are both things to fix. If not, then I think it might be ok but unnecessary to do something. My understanding is that there are/were coatings on the interior of the tank so as to preserve them, and that doing much of anything will alter that.
Coating is a correct term, I'm not familiar with the cut-in-half and weld shut again approach but it sounds better than most.
Also, why has your tank been drained a couple of times, and when drained, was there solids coming out of the tank? Are you having clogged fuel filter issues? Or is this entirely for preservation of a car that isn't having issues with the fuel tank and you want it to stay that way... If that's the case then I would defer to the opinions of others. My experience is from the perspective of having had a couple of cars with gas sitting for years and needing to fix things such that they were not clogging up the fuel system.