GM Genuine Parts GT337 Fuel Tank Filler Cap (23373281) | OE Replacement

GM Genuine Parts GT337 Fuel Tank Filler Cap — OE Replacement

The GT337 is a factory-grade replacement cap designed for GM vehicles. It features a threaded design paired with a durable rubber gasket to form a reliable seal at the fuel filler neck. This cap helps keep fuel contained while shielding the filler area from dirt, water, and other contaminants, supporting a cleaner, better-looking engine bay over time.

What this cap does

• Provides a tight seal to keep the fuel tank closed and secure
• Rubber gasket helps prevent leaks and shields the filler neck from dirt and moisture
• Some versions include a check-valve to vent air as needed, balancing pressure inside the tank
• Sealing the system can contribute to reducing fuel vapor emissions during operation
• GM-recommended replacement part that matches the original factory component for your GM vehicle
• Secures firmly during driving to minimize accidental opening and fuel loss

Why choose GM OE quality for your vehicle

• Consistency: same performance, durability, and service life you expect from General Motors
• Fit and ease of install: engineered for a precise, factory-like fit when replacing the original cap
• Reliability you can count on: designed to withstand routine driving conditions and exposure to fuel and weather
• Environment-conscious design: a sealed system helps minimize fuel vapors escaping to the atmosphere

Variant features you may encounter

Some GT337 caps include a check-valve that vents air in response to tank pressure changes. This feature can help maintain stable pressure during fueling and driving. Other configurations emphasize a robust gasket and durable materials designed for long-term use.

Real-world usage and benefits

Whether you’re performing routine maintenance, replacing a worn cap, or restoring the original look of the filler area, the GT337 supports a straightforward swap with minimal tools. Expect a dependable seal that helps protect the filler area from dirt, reduces routine fuel loss, and supports the integrity of your GM vehicle’s fuel system over time.

Installation tips and compatibility

As an OEM part, GT337 is designed to fit GM vehicles that used the original component for this area. Before replacement, confirm exact fitment with your vehicle’s year, make, and model. Follow standard safety practices when working around the fuel system and consult your vehicle’s service guidelines for best results.