Fuel System Pressure Release
- Turn OFF the ignition. Remove the rear seat cushion. Disconnect the negative battery cable in order to avoid possible fuel discharge if an accidental attempt is made to start the engine. Remove the 2 mounting nuts from the injector sight shield (top engine cover). Lift the injector sight shield off the mounting studs by lifting at the front of the cover.
- Connect the Fuel Pressure Gauge (J-34730-1A), or equivalent, to the fuel pressure valve on the fuel rail. See Fig 1
. Wrap a shop towel around the fitting while connecting the gauge in order to avoid spillage. Install the bleed hose into an approved container. Open the valve in order to bleed the system pressure. Fuel connections are now safe for servicing. Drain any fuel remaining in the gauge into an approved container.
Courtesy of GENERAL MOTORS CORP.