how to check function of turbo scavenge pump
 

How would you test the oil scavenge pump for the turbo drain tank?
I am trying to see if I have a scavenge problem with my turbo oil tank scavenge pump which is driven off the driver side camshaft.
How do you check this without removving it from the engine. I would like to see if it is working properly on a running engine, and if there was a way of checking the flow rate.
I am not sure if this is root cause for my turbo blowing oil past the seals into the intercooler and eventually the intake.
Only seems to be a real issue at track events.

get a clear jug/beer pitcher/ measuring cup (large). Fill it half way with oil, run a line from the scavenge pump line into the jug with the end being under oil. then put the jug under the turbo oil outlet. Depending on which way the oil level in the jug moves, you will have your answer.

Not sure how well this will work for you, but I saw a guy do something very similar on here to see how much oil was running from his drip tank