Fuel System Pressure Release: Gasoline

Fuel system is under pressure. Pressure must be relieved prior to servicing fuel system. Fuel pressure may be relieved by using one of the following methods:

• On 1.3L and 1.8L, loosen fuel filler cap to relieve tank pressure (do not tighten at this time). On 1.3L and 1.8L, remove fuel pump relay. On all models, start and run engine until it stalls. Crank starter for 3 seconds to remove remaining fuel from fuel lines. Turn ignition off. Reinstall circuit opening relay or fuel pump relay. Disconnect negative battery cable to avoid possible fuel discharge in accidental attempt to start engine.
• On 1.9L, 3.0L, 3.1L, 3.4L, 3.5L, 3.8L, 4.0L, 4.6L and 5.7L, disconnect negative battery terminal. Loosen fuel filler cap. Install Fuel Pressure Gauge (J-34730-1A) on fuel pressure connector of fuel rail. Wrap shop towel around pressure connection when installing fuel pressure gauge to absorb fuel leakage. Install gauge bleed hose in container. Open bleed valve to bleed fuel pressure.
• On 2.2L and 2.4L Cavalier and Sunfire, loosen fuel filler cap to relieve tank pressure (do not tighten at this time). Disconnect fuel pump connector. Start and run engine until it stalls. Crank starter for 3 seconds to remove remaining fuel from fuel lines. Turn ignition off. Reconnect fuel pump connector. Disconnect negative battery cable to avoid possible fuel discharge in accidental attempt to start engine.
• On 2.2L Saturn, connect scan tool to Data Link Connector (DLC). Start engine. Using scan tool special tests function, select PCM/EC, and then select fuel delivery. Select FUEL PUMP and command fuel pump off. Engine will stall in 3-5 seconds. Turn ignition off.