Kia Optima: Release Residual Pressure in Fuel Line - Repair procedures - Fuel Delivery System - Engine Control/Fuel System - Kia Optima TF 2011-2022 Service ManualKia Optima: Release Residual Pressure in Fuel Line

Whenever the high pressure fuel pump, fuel pipe, delivery pipe, or injector is removed immediately after shutting off the engine, an injury may be caused by the release of highly pressurized fuel. Release the residual pressure in the high pressure fuel line by referring to the "Residual fuel pressure release procedure" below before removing any high pressure fuel system components.

Wear safety glasses and fuel resistant gloves.

1. Turn the ignition off and disconnect the battery negative cable.
2. Remove the fuel pump relay (A).

3. Disconnect the electrical connector from the high pressure fuel pump.
4. Reconnect the battery negative cable.
5. Run the engine for about 20 seconds to lower the pressure in both the high or low pressurelines. The engine may shut off within the 20 second period. If not, turn the engine off.
6. Proceed with the service or repair. Use rags to cover opening and catch spills when opening up the high pressure system.
7. Reinstall / re-connect all components in reverse order of removal. Start engine and confirm proper operation, and make sure there are no fuel leaks.
8. After completing, clear DTC(s) using GDS scan tool (the procedure described above will cause DTC to set).

Fuel Pressure Test
1. Release the residual pressure in fuel line (Refer to Release Residual Pressure in Fuel Line in this group). ...

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