Yes, low OP, went to 0 suddenly. 57000 miles. By pass spring in filter base looks good.

I also pulled the distributor and put a electric drill on the op shaft. Spins the pump and I can hear oil sloshing but doesn't pull the drill down much.(like the chevy's did back in the old days).

I'm dreading puling the engine, and looking for any other possibilities.

Thanks,

John