As far as how they are driven? Are they electric or are the directly powered by the engine itself? Situation...when you turn the key does the pump start moving at its normal pace electrically or does it turn in proportion to the engine revolutions (driven by the engine itself). Hope this makes since. If its electric, as soon as you turn the key to start it should be pumping oil at full power, if its driven by the engine, you have to wait for the engine to fire up for the oil pump to be fully operational.