Yukon XL 2500 2WD V8-6.0L VIN N (2006)
5. Carefully lift the fuel tank module from the fuel tank, enough to access the quick connect fitting below the module cover.
6. Disconnect the vapor line quick connect fitting (1) in order to remove the module.
7. Remove the module from the fuel tank.
8. Remove and discard the fuel tank module seal.
9. Place the lock ring on a flat surface. Measure the clearance between the lock ring and the flat surface using a feeler gage at 7 points.
IMPORTANT:
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Some lock rings were manufactured with "DO NOT REUSE" stamped into them. These lock rings may be reused if they are not damaged or
warped.
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Inspect the lock ring for damage due to improper removal or installation procedures. If damage is found, install a NEW lock ring.
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Check the lock ring for flatness.
10. If warpage is less than 0.41 mm (0.016 in), the lock ring does not require replacement.
11. If warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced.
INSTALLATION PROCEDURE
