Removal & Installation (5.3L)
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE under FUEL SYSTEMS. Raise and support vehicle. If equipped, remove the transfer case shield. Remove 2 fuel composition sensor bracket-to-frame rail mounting nuts. See Fig 1.
- Disconnect fuel composition sensor inlet and outlet pipes. See FUEL LINE DISCONNECT FITTINGS under FUEL SYSTEMS. Disconnect fuel composition sensor harness connector. Remove 2 fuel composition sensor bracket-to-frame rail mounting nuts.
- Remove fuel composition sensor and mounting bracket from frame rail. Remove fuel composition sensor-to-mounting bracket bolts. Separate fuel composition sensor from mounting bracket. To install, reverse removal procedure. Tighten fasteners to specification. See TORQUE SPECIFICATIONS .
- Connect negative battery cable. Turn ignition switch to ON position for 2 seconds. Turn ignition switch to OFF position for 10 seconds. Turn ignition switch to ON position. Check for fuel leaks. Repair as necessary.