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Rollover/Vent valve: XJ vs MJ Interchange

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Are the fuel tank rollover valves/vent valves interchangeable between the XJ and MJ (specifically 1990)? I discovered my tank is holding a lot of pressure and apparently neither vent valve works. I pulled a set of vent valves from a '90 XJ that work fine (vacuum tested both) and they look like they'll fit. I know the tanks & sending units are different so before I drop the tank again I wanted to confirm they would, in fact, be a direct replacement.

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