You sure you didn't pour oil down the drain channel?
If the feed really is blocked you might be able to free it up with compressed air.
The only problem is that you might just push the blockage back into a more critical oil feed area. I feel a strip down coming on.
You are sure the pump is working ok though? Could the pressure relief valve be stuck open? Pick up gauze choked? For the latter item you could look inside the sump with a usb inspectio camera, they can be had off ebay for 35, less than an hours labour.
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