So pulled line going to reservoir cap and stuck it in a bottle of water...nothing.

Tomguy might be on to something: I keep reading about reservoir needing to be above pump... Going to test this next...think I have a funnel that may do the trick.

If this is the case, I may need to locate a washer pump (from some other junker), that runs irrespective of position relative to reservoir.

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Current:
1971 Mercedes Benz 250 (Euro Spec)
1972 Mercedes Benz 250 (US Spec)
Past:
1972 Mercedes Benz 280