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I think once....

2 #10 swivels, a #10 union and 24 inches of i/2 in id clear hose. If they don't have hose that the reusable fittings will work on, the push on swivels work fine. Keep in mind this one is 25 or so years old.

No I get it, hence the word "should", sometimes one off things happen, they are mechanical of course, and if something came into the shop with this complaint, and had a leak there, the first thing I would do was to address the leak. If it fixed the symptom, awesome, a quick easy fix with minimal...

That is gear pump return. Should have zero effect on running, only a leak. Flow only, no pressure there and return to the tank. It does sound like air. Install a looped clear line at the pump inlet and look for bubbles coming from the chassis.