LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Kia >> 2004 >> Optima EX, 2.4 6 >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery System >> Fuel Tank >> Inspection
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Fuel Tank: Inspection

  1. Check the hoses and the pipes for cracks or damage.
  2. Check the fuel tank cap for proper operation.
  3. Check the fuel tank for deformation, corrosion or cracking.
  4. Check the fuel tank inside for dirt or foreign material.
  5. Check the in-tank fuel filter for damage or restriction.
  6. Test the two-way valve for proper operation.
  7. Using a vacuum hand pump, check the operation of the two-way valve.
    TWO WAY CHECK VALVE

    Valve pump Guide lines for acceptance or rejection
    When connected to inlet side Negative pressure generated and vacuum maintained
    When connected to outlet side No negative pressure generated
    Fig 1: Testing Two-Way Valve
    G02535573Courtesy of KIA MOTORS AMERICA, INC.