GM Genuine Parts GT359 (22921366) Fuel Tank Filler Cap - E85 FlexFuel Cap with Locking Option

Overview

The GM Genuine Parts GT359 Fuel Tank Filler Cap is a threaded cap designed to seal the fuel filler neck on your GM vehicle. As a GM OE recommended replacement, it is crafted to match the original specifications for fit, form, and function, so you can rely on a familiar, factory-like experience after service.

This cap is available in both locking and non locking versions. Its distinctive E85 yellow design serves as a visual reminder of FlexFuel compatibility, helping you spot the correct fuel option at a glance while on the go.

Key design and performance

• Designed for FlexFuel vehicles and provides a visual reminder of E85 compatibility
• GM recommended replacement part for your GM vehicle's original cap
• Delivers the quality, reliability, and durability associated with GM OE parts
• Manufactured to GM OE specification to ensure proper fit, form, and function

Practical benefits and use cases

• Locking option adds security for the fuel filler area when needed
• Non locking version gives a simple and straightforward replacement choice
• Rubber gasket provides a liquid tight seal to keep fuel in and keep water and dirt out
• Bright E85 yellow color acts as a quick, at-a-glance indicator forFlexFuel capable equipment

Real world scenarios

Whether you are refueling on a long road trip or routinely switching between gasoline and E85 blends, this cap is designed to stand up to everyday use. It pairs with GM vehicles to maintain consistent performance expectations while offering an intuitive replacement path when needed. The combination of a sturdy sealing gasket, correct thread engagement, and the option to lock adds versatility for different driving environments and personal preferences.

Compatibility and installation notes

The GT359 is built to align with GM OE specifications, supporting a snug fit, reliable operation, and long service life when installed as a replacement part for your GM vehicle. For best results, confirm vehicle compatibility and select either locking or non locking variants as appropriate for your needs. This approach helps preserve the integrity of the fuel filler area and supports proper fueling procedures.