Brakes are hard at startup and engine doesn't always shut off immediately with the key. Fuel cut off valve tests good and shuts engine down with a mitivac.

Vac at idle measured at the pump with 2 vac gauges measures 8". Vac quickly goes to 20" when engine is revved. Both gauges match each other and also go to 25" when connected to the Dodge Cummins engine.

Pump itself is Piersburg bought new with approx 8,000 mi on it.
Main check valve works - ie lets air into the pump but not the other way.

The attached pics are how the pump came off the car without any cleaning.

Is the next step to disassemble the pump? No kits are available so I'd either have to reuse gaskets or make some with by using a ballpeen hammer.

Edit: I didn't disassemble the ramp but there is no obvious side to side play. The bearing in the back of the pump is nice and smooth.

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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.