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Home >> Chevrolet >> 2017 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 29 (Engine Controls And Fuel - 1.8L (LKN) - DTC P0446 To DTC P2635 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Fuel System Diagnosis >> Circuit/System Testing >> Fuel Pressure Leaks Down

Fuel Pressure Leaks Down

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  1. Ignition Off, relieve the fuel pressure.
  2. Install the EN-37287  between the chassis fuel feed hose and the engine compartment fuel feed pipe.
  3. Open the valve on the EN-37287  .
  4. Ignition On, command the Fuel Pump Enable On and then Off with a scan tool.
  5. Close the valve on the EN-37287  .
  6. Verify that the scan tool Fuel Pressure Sensor parameter does not decrease more than 34 kPa (5 PSI) in 1 min.
    • If greater than 34 kPa (5 PSI) 

      Replace the G12 Fuel Pump.

    • If less than 34 kPa (5 PSI) 
  7. Test for a faulty fuel feed front pipe check valve.
    • If a condition exists 

      Replace the fuel feed front pipe.

    • If no condition exists 
  8. Test for a leaking G18 High Pressure Fuel Pump.
    • If a condition exists 

      Replace the G18 High Pressure Fuel Pump.

    • If no condition exists 

      Locate and replace the leaking Q17 Fuel Injector.

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