Lift pump yes, main pump no. I monitor lift pump pressure, along with rail pressure, boost, EGT and with separate gauges real oil pressure and trans temp (even though it's a manual). I replace the lift pump when the pressure starts to drop (still has filter mounted pump so they are good for about 80,000 miles). Since it improved so much when I retorqued the feed tubes my logic was the maim pump must be ok. No loss in power or how it runs, just slow start.