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If you can measure the oil pressure, find out if its ok (it must make a minimum of at least 10 psi for every 1,000 rpm in other words, at idle you need a minimum of 10 psi, at 2,000 rpm 20 psi, and so on, to a maximum of about 40 or 50 at which point the relief valve opens).
If the pressure is good, i wouldnt change the oil pump, there's no reason! It lives bathed in oil after all, if its making pressure, and its not too much work to change all the seals like needing a hydraulic press or something, i'd just do the seal change.
(And If your oil pressure does turn out to be too low, chances are the main and rod bearings are worn too so no point in changing the oil pump then either.)
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