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I know you'll need a return line back to the tank from the 2.5 fuel pressure regulator. I have my doubts that a tank from a 2.6 will work because it probably doesn't have much of a baffle or a reservoir for the pickup sock. That means when you corner with a 1/3 of tank or less, the pickup from the electric pump will get air in it and the car will stall. You would also need to make sure the opening is the right size for an electric pump and the depth is right for the pickup to be at the bottom.

What year 2.5 are you putting in? Fuel pressure requirements for EFI cars were 15 PSI up until 1991 and in that year they went to 39 PSI.
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