Sierra 1500 4WD V8-4.8L (2007)
8. Open the axle vent hose clip on the fuel fill pipe bracket.
9. Remove the rear axle vent hose from the clip.
10. If equipped with 5 ft 8 in. bed, perform the following steps:
11. Disconnect the fuel tank evaporative emission (EVAP) line quick connect fitting (2) from the fuel fill pipe recirculation line.
12. Loosen the fuel tank fill pipe clamp (1) at the fuel tank.
13. Remove the fuel tank fill pipe.
14. Cap the opening on the fuel tank in order to prevent possible system contamination.
