GM GENUINE PARTS Fuel Tank Filler Cap GT261 (19207873) OEM threaded seal, rubber gasket, factory fit

GM Genuine Parts GT261 (19207873) is an OEM threaded fuel tank filler cap engineered to seal the tank, block contaminants, and match factory fit and durability.

This fuel tank filler cap from GM Genuine Parts replaces your vehicle's original cap with a part designed to the same specifications used at the factory. It includes a molded rubber sealing surface to reduce vapor escape and keep water and debris from entering the tank. Some units include a pressure-relief/check valve that equalizes tank pressure as needed; regardless, the cap is tested to meet General Motors quality and fit standards so installation is straightforward and reliable.

How does this cap help control fuel vapors and pressure?

The GT261 cap creates a tight mechanical seal around the filler neck using a precision-molded rubber gasket. By sealing the opening, it helps limit vapor loss and prevents stray odors. When equipped with a check-valve, it also allows air to move into or out of the tank to balance internal pressure safely.

• Rubber gasket provides a leak-resistant seal
• Threads match GM filler-neck dimensions for secure fit
• Optional check-valve equalizes tank pressure as designed
• Helps reduce fuel vapor emissions during normal conditions

Will this cap fit my GM vehicle and install easily?

GT261 (19207873) is manufactured to GM original-equipment specifications for compatibility with matching filler necks used on specific GM models. Installation is typically a simple hand-thread and twist until it seats against the gasket—no special tools required. Always confirm the part number against your vehicle’s year, make, and model to ensure a correct match.

• Made to GM OE dimensions for proper fit, form, and function
• Hand-thread installation, no tools needed for most vehicles
• Check part number (GT261 / 19207873) against your vehicle guide
• Replace when cap shows wear, leaks, or fails pressure tests

How does this OEM cap compare with aftermarket alternatives?

As an OE-specified component, the GM Genuine Parts cap is produced to the same standards and testing criteria used by GM, which helps ensure consistent performance and longevity. Aftermarket caps can vary in materials and tolerances; choosing the GM part reduces the risk of fitment issues or premature degradation. For drivers who want the same quality their vehicle left the factory with, this cap is the direct-replacement choice.

• Built to GM testing and manufacturing standards
• Materials and tolerances match factory expectations
• Lower chance of fitment or sealing problems than unknown aftermarket units
• Backed by GM engineering and part identification

When should I replace my fuel tank filler cap?

Replace the filler cap if you notice fuel odors, fuel warning lights related to evaporative emissions, visible gasket cracking, cross-threading, or if the cap no longer tightens securely. Regular inspection during maintenance intervals helps catch wear before it impacts fuel system performance. Swapping to a GM Genuine Parts cap restores factory sealing characteristics.

• Replace with visible gasket damage or hardening
• Replace if threads are damaged or not seating
• Replace if fuel smell or vapor-related dashboard warnings appear
• Use GT261 (19207873) for correct OEM replacement

Who is this for? Drivers and technicians seeking a direct, factory-spec replacement fuel tank filler cap for compatible GM vehicles will benefit from the GT261 (19207873). It’s suited to owners who prioritize proper fit, reliable sealing, and OEM traceability—especially when diagnosing evaporative system concerns or performing routine fuel-system maintenance.