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Fuel Tank Leak Test: Description

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The fuel tank leak test is used to locate any fuel or fuel vapor escaping the fuel tank area. Fuel vapors escaping above the fuel level will be detected when the EVAP diagnostics completes one test cycle. The malfunction indicator lamp (MIL) will illuminate after the evaporative emission (EVAP) diagnostics completes two test cycles.

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