I think the FAST lift pump is similar to the stock lift pump, in regards to pressure . . .HOWEVER, the FAST unit is more robust and will last . . . my pressure gauge is 15psi on max side, and I have seen the needle pegged over 15psi . . . when I was pulling hard up the mountains (5th gear, 2100rpm, 55mph) towing the trailer, it was down to 11psi . . .