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Does a 1996 Chevy Blazer need pre vent gas cap?

No, a 1996 Chevy Blazer does not require a pre-vented gas cap. While many newer vehicles do, vehicles from that era typically used a simple, non-vented gas cap. The Evaporative Emission Control (EVAP) system on a 1996 Blazer manages fuel vapors differently than newer systems that rely on a vented cap. Using a vented cap on a 1996 Blazer could actually harm the EVAP system.