The procedure is to remove the fuel tank, disconnect the evaporative emission (EVAP) lines and the fuel line, reposition the fuel feed and EVAP lines, unlock the fuel sender lock ring, remove the fuel sender, remove and discard the fuel sender O-ring seal, clean and inspect the fuel sender assembly O-ring seal sealing surfaces, place the lock ring on a flat surface and measure the clearance between to lock ring and the flat surface. If the warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced.