"ACDelco GM Original Equipment Fuel Tank Caps are designed, engineered, and tested to rigorous standards, and are backed by General Motors. When a lost or worn-out cap triggers a check engine light due to minor vacuum leaks, replacing it restores vital system integrity and stops raw fuel odors from escaping around the filler door. A tight seal on the fuel filler neck is essential to prevent gas evaporation, maintain proper pressure inside the vehicle gas tank, and support the evaporative emissions system by trapping harmful gases. By keeping dirt and moisture out of your fuel supply, these components protect the internal fuel pump from outside contamination and help maintain consistent fuel economy during daily driving. Built to withstand daily refueling and frequent temperature changes, these replacements integrate updated materials and technologies to deliver reliable performance in freezing winters and hot summers. Whether you are navigating rough road travel or simply commuting, a secure closure ensures reliable vehicle operation and provides peace of mind by locking in fuel vapors ACDelco GM Original Equipment parts are the true OE parts installed during the production or validated by General Motors for GM vehicles."

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• Delivers reliable performance in freezing winters and hot summers
• Ideal for keeping gas secure during rough road travel
• Provides peace of mind by locking in fuel vapors
• Maintains proper pressure inside the vehicle gas tank
• Protects the internal fuel pump from outside contamination
• "GM engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle"
• "Original equipment parts are designed to work with your GM vehicle safety systems -- aftermarket replacement parts may not meet the same OE safety regulations, depending on the part type"
• GM regularly updates production and service part designs to integrate new materials and technologies