LS V8-3.9L VIN A (2003)
Fuel Pressure Release: Service and Repair
Fuel Pressure Gauge
SPECIAL TOOL(S)
WARNING:
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Do not smoke or carry lighted tobacco or open flame of any type when working on or near any fuel-related component. Highly flammable
mixtures are always present and may be ignited, resulting in possible personal injury.
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Fuel in the fuel system remains under high pressure even when the engine is not running. Before repairing or disconnecting any of the
fuel lines or fuel system components, the fuel system pressure must be relieved to prevent accidental spraying of fuel, causing personal
injury or a fire hazard.
1. NOTE: 3.0L shown, 3.9L similar.
Remove the Schrader valve cap and install the special tool.
2. Slowly open the manual valve on the special tool and relieve the fuel pressure.
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This will drain some fuel out of the system.
