Pressure Release Procedure
- Disconnect the negative battery cable to avoid possible fuel discharge if an accidental attempt is made to start the engine.
- Remove the fuel injector sight shield. For models not equipped with a supercharger (VIN K), go to next step. For models equipped with a supercharger (VIN 1), go to step 4.
- Remove oil filler neck. Lift the front of the shield up and pull towards the front of the vehicle. See Fig 1. Remove fuel injector sight shield. Go to step 6.
- Clean the area around the oil fill cap/tube before removing the tube/oil fill cap to prevent contaminants from falling into the valve rocker arm cover opening.
- Twist counter-clockwise to unlock the oil fill cap/tube from the valve rocker arm cover. Remove nut at center of cover. Lift the fuel injector sight shield up at the front and slide the tab out of the engine bracket. See Fig 1. Replace the oil fill cap/tube in the valve rocker arm cover. Go to next step.
- Loosen the fuel filler cap to relieve tank vapor pressure.
- Connect Fuel Pressure Gauge (J 34730-1A), or equivalent, to the fuel pressure connection, located on the fuel rail. See Fig 2. Wrap a shop towel around the fuel pressure connection while connecting the fuel pressure gauge to avoid spillage.
- 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.
- Drain any fuel remaining in the fuel pressure gauge into an approved container.
Courtesy of GENERAL MOTORS CORP.
Courtesy of GENERAL MOTORS CORP.