Fuel System Pressure Release
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
Remove fuel tank cap and release fuel system pressure before servicing any fuel injection-related components. After releasing fuel system pressure, a small amount of fuel may be released when servicing fuel lines, fuel pump or fuel connections. Cover the fuel system components with a shop towel before disconnection. DO NOT allow fuel to contact engine or electrical components.
CAUTION:
Fuel system is under pressure. Pressure must be released prior to servicing fuel system.
On all models except 4.3L, remove engine sight shield. See ENGINE SIGHT SHIELD under MISCELLANEOUS. On all models, disconnect negative battery cable. Loosen fuel filler cap. Install Fuel Pressure Gauge (J-34730-1A) on fuel pressure connector of fuel rail. Wrap a shop towel around pressure connection when installing fuel pressure gauge to absorb fuel leakage. Place gauge bleed hose in container. Open bleed valve to release fuel pressure.