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Home >> Kia >> 2016 >> Optima SX Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 88 (Fuel Delivery System - 1.6L - Optima (Except HEV)) >> Release Residual Pressure in Fuel Line

Release Residual Pressure in Fuel Line

WARNING: This page is about a different variant/trim than selected.
CAUTION: Whenever the high pressure fuel fuse, 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.
NOTE: Wear safety glasses and fuel resistant gloves.
  1. Turn the ignition off and disconnect the battery negative (-) terminal.
  2. Remove the fuel pump fuse (A).
    Fig 1: Removing Fuel Pump Fuse
    G11823576Courtesy of KIA MOTORS AMERICA, INC.
  3. Reconnect the battery negative (-) terminal.
  4. Run the engine for about 1 minutes to lower the pressure in the low pressure line.
  5. Turn the engine off.
  6. Disconnect the low pressure fuel line quick connector at the High Pressure Pump. Use rags to cover opening and catch spills while removing the fuel line.
  7. Start the engine, let it idle and then turn the ignition switch OFF after the engine has stopped on its own.
  8. Proceed with the service or repair. Use rags to cover opening and catch spills when opening up the high pressure system.
  9. Reinstall/re-connect all components in reverse order of removal. Start engine and confirm proper operation, and make sure there are no fuel leaks.
  10. After completing, clear DTC (s) using KDS/GDS scan tool. (The procedure described above will cause DTC to set.)