More than likely something has happened to the hose and regulator on your grill. Your gas grill is equipped with a Type 1 connection device with the following features: 1. The system will not allow gas flow from the propane tank until a positive connection to the valve system has been made. (Note: The propane tank valve and all the grill burner knobs must be turned OFF before any connection is made or removed.) 2. A regulator flow limiting device, when activated, restricts the flow of gas to 10 cubic feet per hour. If the flow limiting device is activated, perform the regulator resetting procedure.