System Inspection

Check the fuel filter for blockage
Remove the fuel pump and check filter debris and clogging of the fuel supply line.
Check the fuel level
If you run out of fuel significantly on ramp, it may be a factor of degradation of the fuel pressure.
Check low-pressure fuel supply line leakage and blockage.
Low-pressure fuel supply line damage and blockage can be a factor of the fuel pressure drop.
Check Fuel Pressure Regulator
- Fuel Pressure Regulator performance check by measuring voltage and current.
  1. Back probe and measure voltage by using and connecting channel A (+) voltage probe to High side and channel A (-) voltage prove to Low side.
  2. Measure operation current by using Low Current Sensor Module.
    
    Fig 1: Fuel Pressure Regulator Waveforms - Engine Idle After Warm Up
    Courtesy of KIA MOTORS AMERICA, INC.
    
    Fig 2: Fuel Pressure Regulator Waveforms - 2000 RPM
    Courtesy of KIA MOTORS AMERICA, INC.
    
    Fig 3: Fuel Pressure Regulator Waveforms - 3000 RPM
    Courtesy of KIA MOTORS AMERICA, INC.
  3. Are all listed items normal?
    YES
    - Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
    NO
    - Recheck the item from this troubleshooting guide steps, and replace or repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.