Fuel Pressure Relief Procedure

Tools Required

J 34730-1A Fuel Pressure Gage

CAUTION: Relieve the fuel system pressure before servicing fuel system components in order to reduce the risk of fire and personal injury.

After relieving the system pressure, a small amount of fuel may be released when servicing the fuel lines or connections. In order to reduce the chance of personal injury, cover the regulator and the fuel line fittings with a shop towel before disconnecting. This will catch any fuel that may leak out. Place the towel in an approved container when the disconnection is complete.

Fig 1: Identifying Fuel Pressure Gauge J 34730-1A

Courtesy of GENERAL MOTORS CORP.

Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
Install the J 34730-1A . Refer to Fuel Pressure Gage Installation and Removal .
Loosen the fuel fill cap in order to relieve fuel tank vapor pressure.
Open the valve on the J 34730-1A in order to bleed the system pressure. The fuel connections are now safe for servicing.
Drain any fuel remaining in the gage into an approved container.
Once the system pressure is completely relieved, remove the J 34730-1A . Refer to Fuel Pressure Gage Installation and Removal .