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Are these two tanks interchangeable?
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The Zetec tanks were, I think, plastic and a 12. something gal capacity. The PZEV Duratec tanks are steel with a 14 gal capacity. You'll need a Duratec PZEV-specific exhaust system, too, due to the muffler sizing in that area.
There may be more than that; more than what meets the eye. I wouldn't attempt the swap without a complete Duratec donor fuel system (assuming you want the larger, steel tank).