I installed a fuel pressure gauge this morning. I went off the fitting at the back of the filter housing, with Genos hose. Truck idles at 8 psi, at about 1900-2000 rpm it goes down to about 2 psi. Does anyboby have a Carter's part number for the lift pump. I thought I might check a local truck parts dealer to compare a price with that of the Cummins Service center.