Allis B oil pump

To put it simple, it works like placing your finger over a drinking straw while in a glass of water and lifting up and out of the water. When you lift your finger the straw loses its prime so to speak.
It could very well be getting air thru the stem where the ball check is not holding. Could be a cracked or loose pick up pipe. Could be several other things as well. The only way to know for sure is to start taking things apart and inspecting every thing.
 

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