High Pressure Lock-Off Solenoid: Removal
WARNING: This page is about a different car, the 2003 GMC Sierra and 2003 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE under FUEL SYSTEMS. Disconnect the negative battery cable(s). Remove the fuel tank cover. See FUEL TANK COVER under FUEL SYSTEMS. Remove the truck body or side panel as required on RPO ZW9 equipped vehicles in order to gain access to the right side of the CNG fuel tank. Disconnect the High Pressure Lock-Off (HPL) solenoid connectors. Vent the CNG fuel pressure from the tank. See FUEL TANK VENTING PROCEDURE under FUEL SYSTEM PRESSURE RELEASE under FUEL SYSTEMS. Disconnect the vent hose from the HPL solenoid. See Figure . Remove the line fittings and discard the "O" rings. Remove the manual vent tool.
- Using HPL Crowsfoot, loosen the HPL solenoid. On Pickups, remove the CNG fuel tank from the vehicle. See FUEL TANK under FUEL SYSTEMS. For all vehicles, unthread the HPL solenoid from the CNG fuel tank and discard the "O" ring. Inspect the inside of the CNG fuel tank for water, rust, or other contaminants. If necessary, clean the CNG fuel tank. See FUEL TANK CLEANING under FUEL SYSTEMS.