Any way I measure, I get 8" at idle. Vacuum goes up to 20" if the engine is revved and stays there as long as the engine is revving. Vacuum slowly settles to 8" when the engine returns to idle. The one way valve tests good.

I'm going to check warranty but will likely end up replacing or installing a kit. Any suggestions on what kit or what brand of pump?

I won't explore further to fine reasons for failure until parts are in hand because I want to keep the car mobile. Strange that this crapped out with out many miles.

Edit: I think the pump was a Pierburg

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.