I refer to this diagram frequently to find answers. You may want it in favorites. I also looked in my machine. As you face the machine the hose most rightward, most toward the outside of the machine is the OPV return hose, #35. The most central is the water pickup, #48. I pulled out the tank and put a fairly large glass/pitcher under the intake hose. I used a regular glass to make it easy on the output/OPV side. Turn on the pump with a blind basket in the PF and start timing the OPV discharge from first discharge in the glass, a few seconds after pump on. Time for 15, or 30 seconds and convert to flow.
You will no doubt run a couple of times to check and perhaps adjust OPV. Allow the pump to rest for about 2 minutes between runs. They are designed for intermittent duty cycle and rest.
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