I was under the impression that the tanks had some sort of coating on the inside to keep them from rusting. I my case the coating must have failed because I've never seen that much rust in a tank before.

I've seen additive and varnish build up "flake" off into the bottom of the tank but this stuff was different. Come to think of it, what I saw may be the coating. I'll dig some out of the tank and look at it.

Many years ago we had a shop here in town that would dip the tank in a solution that would eat all the junk out and then they would recoat them with some chemical to line the tank. Back in the day it cost $40 but there is no shop around here that will mess with a gas tank anymore.

I've coated a few tractor tanks on some of the old stuff I've restored. The kit was a two step process that used a chemical to "etch" the inside of the tank and another to seal it. It worked great.

Tony T
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Tony Turner 89 Volvo 240DL 257K, 92 Jeep Cherokee 250K, 93 Jeep Grand Cherokee 215K, 1980 Mercedes 240D 360K