K 1500 Yukon 4WD V8-5.3L VIN Z Flex Fuel (2003)
4. Remove the fuel pipe ground strap bolt.
5. Separate the ground straps (1, 2).
6. Remove the rear axle vent hose from the retaining clip (2).
7. Loosen the fuel tank fill pipe clamp at the rear tank.
8. Loosen the vent hose clamp at the rear tank.
9. Separate the fill pipe from the rear tank.
10. Separate the vent hose from the rear tank.
11. Remove the fuel fill pipe.
12. Cap the open end of the fuel tank to prevent system contamination.