In Reply to: 8N losing oil prime posted by Greg Davis on July 22, 2020 at 20:47:54:
Check the new pump gears. There are a raft of bad rebuild kits on the market and I hear this story a lot. First thing I do when I get a new kit is measure the face width of the pump gears.
The narrow gears should measure .561/.562 and the wider gears should be .724/.725.
The gears in the defective kits are about .010 undersize and will bypass badly giving exactly the results you have.