Gumout, Regane, and Techron are fairly interchangeable as far as fuel system cleaners go, as they all use PEA as their active cleaning agent. There is some variation in PEA concentration among the three, but that's the ingredient in each that makes them do what they do.
If you used Techron with no issues, I don't see how a switch to Regane would cause the kind of mechanical failure you're describing. Its more probable that the mechanical issue existed already, but only became apparent when the fuel system cleaner was used.
A similar analogy is the old myth that switching to synthetic often causes older engines to leak; more accurate is that the condition was already present, but the additional detergents/dispersant found in many synthetics remove enough build up that they simply reveal an already worn gasket for what it is; yet this is incorrectly attributed to the synthetic as the cause of the leak. That myth still persists today.
If any of these cleaners were able to create the condition you describe, your experience wouldn't be the isolated case it is - there would be several threads like this, or others chiming in to point out how they had the same thing happen.
-Spyder
If you used Techron with no issues, I don't see how a switch to Regane would cause the kind of mechanical failure you're describing. Its more probable that the mechanical issue existed already, but only became apparent when the fuel system cleaner was used.
A similar analogy is the old myth that switching to synthetic often causes older engines to leak; more accurate is that the condition was already present, but the additional detergents/dispersant found in many synthetics remove enough build up that they simply reveal an already worn gasket for what it is; yet this is incorrectly attributed to the synthetic as the cause of the leak. That myth still persists today.
If any of these cleaners were able to create the condition you describe, your experience wouldn't be the isolated case it is - there would be several threads like this, or others chiming in to point out how they had the same thing happen.
-Spyder
