With the pump running I get an occasional drip of fuel out of the relief valve on the pressure gauge, but it still doesn't register anything. I am wondering if the schrader adapter is fully engaging. I do get a splurt of fuel if I take the gauge off and press in the adapter top with a screwdriver.

The pump sounds a bit rough to me, but I do hear it constantly running. I asked O'Reilly about a different adapter and all they could say was that kit "works on all vehicles".

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2001 X5 3.0i Old Gold -built and bought 08/2000, now at 220K miles
2005 X5 3.0i Silver Bullet -built 05/2005, bought 03/2021 at 95K miles