Thanks, Mike D.

I made some assumptions which make me look quite brainless. I've put a diesel engine in a gas body, both Gen I w126ers. The gas tank sat empty for years and that bit of rust showed up in the first primary filter after I cranked the diesel engine.

I intend to vat the diesel tank which is sitting out back then replace the gasser tank. I will not treat the inside of either tank.

Sorry for confusing you, I wouldn't have done it if I hadn't been confused.

I made some assumptions which

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84 300SD
85 380SE
83 528e
95 318ic