There is a procedure for verifying the flow.
It should consume from .97 to 1.14 ml in 6 minutes at 2000 RPM.
You can use a large syringe pluged into the oil pump with a hose.
Remove the plunger from the syringe and plug it into the pump using a small hose, hold it up with the tip down fill it with oil and bleed out the bubbles if any from the oil hose and pump.
Run the test and see how much oil it used.
Note the oil pump should always be bleed when the hoses have been disconnected or the tank run dry.
There is a small philips head bleed screw on the front of the pump.
If this is not clear I can scan the page from the manual.