Fuel Line Pressure Check

1. Remove fuel pump relay. (If fuel pump relay is installed inside of the junction box, remove fuel pump relay fuse (20A))
2. Start the engine, wait until engine stops.
3. Install fuel pressure gage between the deliver pipe and fuel hose. (GDI, install between high pressure pump and fuel hose)
4. Install fuel pump relay. (If fuel pump relay is installed inside of the junction box, install fuel pump relay fuse (20A))

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   • 1-Pressure gage
   • 2-Connected to delivery pipe or high pressure pump
   • 3-Fuel feeding line from fuel pump

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   Courtesy of HYUNDAI MOTOR AMERICA

   Courtesy of HYUNDAI MOTOR AMERICA

5. Check if fuel pressure is normal at idle after start the engine.
6. Stop the engine and check if the pressure is maintained.

1. Connect VCI to DLC connector at in panel junction box.
2. Run GDS, select model year and click Service Data button.
3. Start the engine.
4. Monitor parameters related to fuel pressure.

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<Normal pressure at idle>

1. Real low fuel pressure (Absolute) follows target low fuel pressure (Absolute) at idle.
2. Real low fuel pressure is relative pressure so it is lower than absolute pressure.