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So, your initial question remains a valid one: Does the new style primer pump achieve sufficient pressure to crack the check valve.
You might wish to give this a test. Disconnect the line from the IP to the secondary.........at the secondary.........and pump the primer. If you get fuel from this open line..........the pump is doing it's job and the check valve just does not chatter..........for unknown reasons. If you don't get fuel..........the pump is not capable of cracking the check valve.........which would be very bad news.
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I just replaced the original leaking pump with a Black One (circa $14) and I tested it. The ball valve chirps like a cricket in summer. This proves that the pressure is meeting spec.
It was so easy to replace and I had been thinking it would be difficult. 30 minutes. Use a 17mm crowsfoot to tighten. I removed the old one with a Vice Grip since I did not worry about destroying it.