2019 1500 quad cab; 5.7 hemi; P0171 & P0174; both banks running lean suddenly. Spits, sputters no power. Want to do a fuel pump & relief pressure test. Have the equipment. Never done before on this vehicle. Information is lacking online unless you have previous generation. No schrader valve on the fuel rail! Looking for specs for pressure, and best way to tap into pump line?