Optima V6-2.7L VIN 8 (2006)
Fuel Pressure: Testing and Inspection
FUEL PRESSURE TEST
1. Reduce the internal pressure of the fuel pipes and hoses by the following procedures.
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Disconnect the fuel pump harness connector after removing the rear seat cushion.
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Start the engine and after it stalls, turn the ignition switch to the OFF position.
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Disconnect the battery negative (-) terminal.
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Connect the fuel pump harness connector.
2. Remove the bolt connecting the fuel line to the fuel filter.
WARNING: Cover the hose connection with a shop towel to prevent splashing of fuel caused by fuel residual pressure in the fuel line.
3. Using the fuel pressure gauge adapter, install the fuel-pressure gauge to the fuel filter. Tighten the bolt to the specified torque.
Fuel pressure gauge to fuel filter : 25 - 35 Nm (250 - 350 kg.cm, 18 - 26 lb.ft)
4. Connect the battery's negative (-) terminal.
5. Apply battery voltage to the terminal for the pump drive and activate the fuel pump: then, with fuel pressure applied, check that there is no fuel
leakage from the pressure gauge or connection part.
6. Start and run the engine at curb idle speed.
