Fuel Pressure Relief Procedure

Tools Required 

J 34730-1A  Fuel Pressure Gage. Refer to Special Tools .

Fig 1: Identifying Fuel Pressure Gauge J 34730-1A
Courtesy of GENERAL MOTORS CORP.
1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
2. Connect the J 34730-1A  to the fuel pressure connection. Refer to Special Tools . Refer to Fuel Pressure Gage Installation and Removal .
3. Install the bleed hose into an approved container and open the valve to bleed the system pressure. The fuel connections are now safe for servicing.
4. Disconnect the fuel pressure gage from the fuel pressure connection. Refer to Fuel Pressure Gage Installation and Removal .