Fuel Pump

Fuel Pressure
Key ON Engine Running (KOER) - 4.6L, 5.4L 193-310 kPa (28-45 psi)
Key ON Engine OFF (KOEO) - 4.6L, 5.4L 240-310 kPa (35-45 psi)
Key ON Engine Running (KOER) - 6.8L 379-448(a) kPa (55-65 psi)
Key ON Engine OFF (KOEO) - 6.8L 276-345(a) kPa (40-50 psi)
Key ON Engine OFF (KOEO) - 6.0L 0-379 kPa (0-55 psi)
Key ON Engine Running (KOER) - 6.0L 310-379 kPa (45-55 psi)

(a) Measured by the fuel rail pressure (FRP) PID using the vehicle communication module (VCM) and integrated diagnostic system (IDS) with appropriate hardware, or equivalent scan tool. Mechanical gauge fuel pressure readings may vary from scan tool readings.