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Home >> Hyundai >> 2004 >> Elantra GLS, Standard >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel System >> DTC Trouble Shooting Procedures >> DTC P0300: Multiple Cylinder Misfire Detected >> Inspection Procedures >> 5. Check Fuel Line Pressure
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5. Check Fuel Line Pressure

  1. Reconnect the ignition coils and spark plug connectors.
  2. Release the fuel pressure and attach the fuel pressure gauge to the service port on the fuel rail.
  3. Start the engine and warm it up to normal operating temperature.
  4. Check fuel line pressure at idle.

Is fuel line pressure within specification? 

Yes: Go to next step.

No: Check fuel delivery system. Refer to FUEL PRESSURE TEST .