Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

1. Remove the following components from the intake manifold:

•	The gas mass sensor/mixture control valve (GMS/MCV) and the bracket. Refer to Gas Mass Sensor/Mixture Control Valve and Mounting Bracket Replacement in the Engine Controls - 5.0, 5.7L section of the Bi-fuel C/K Supplement.

•	The low pressure regulator (LPR) and the bracket. Refer to Compressed Natural Gas Low Pressure Regulator and Bracket Replacement in Engine Controls - 5.0, 5.7L section of the Bi-fuel C/K Supplement.

•	The gas distribution adapter (GDA). Refer to Gas Distribution Adapter Replacement in Engine Controls - 5.0, 5.7L section of the Bi-fuel C/K Supplement.

•	The union to low pressure lock-off (LPL) fuel line. Refer to Fuel Hoses/Lines Replacement - Intake Manifold to Low Pressure Lock-Off in Engine Controls - 5.0, 5.7L section of the Bi-fuel C/K Supplement.

•	The high pressure regulator (HPR) to union fuel line. Refer to Fuel Hoses/Lines Replacement - High Pressure Regulator to Intake Manifold in Engine Controls - 5.0, 5.7L section of the Bi-fuel C/K Supplement.

2. Remove the intake manifold. Refer to Intake Manifold Removal in Engine Mechanical in the C/K Truck Service Manual.

1. Install the intake manifold. Refer to Intake Manifold Removal in Engine Mechanical in the C/K Truck Service Manual.
2. Install the following components into the lower intake manifold:

•	The gas mass sensor/mixture control valve (GMS/MCV) and the bracket. Refer to Gas Mass Sensor/Mixture Control Valve and Mounting Bracket Replacement in Engine Controls - 5.0, 5.7L section of the Bi-fuel C/K Supplement.

•	The low pressure regulator (LPR) and the bracket. Refer to Compressed Natural Gas Low Pressure Regulator and Bracket Replacement in Engine Controls - 5.0, 5.7L section of the Bi-fuel C/K Supplement.

•	The gas distribution adapter (GDA). Refer to Gas Distribution Adapter Replacement in Engine Controls - 5.0, 5.7L section of the Bi-fuel C/K Supplement.

•	The union to low pressure lock-off (LPL) fuel line. Refer to Fuel Hoses/Lines Replacement - Intake Manifold to Low Pressure Lock-Off in Engine Controls - 5.0, 5.7L section of the Bi-fuel C/K Supplement.

•	The high pressure regulator (HPR) to union fuel line. Refer to Fuel Hoses/Lines Replacement - High Pressure Regulator to Intake Manifold in Engine Controls - 5.0, 5.7L section of the Bi-fuel C/K Supplement.