[Gooserider]

Bill;
Thanks for the kind words. I guess that the incremental failure detection method would be checking for flow volume / pressure, but that isn't all that easy for a user that doesn't have a good collection of test gear. My "look for meltage" check might not catch the marginal failure, but certainly if one sees meltage you KNOW there's a problem.

Purely speculating, but if the decoupling failure effects both volume and pressure then I suspect the easiest test would be to do the quick home made manometer setup and see if the pump could still push the rated head.

Gooserider