GM GENUINE PARTS Fuel Tank Filler Locking Cap GT376 (84308352) — Threaded Keyed Lock, OEM Fit

The GM Genuine Parts GT376 (84308352) is a threaded locking fuel tank filler cap designed to seal your fuel tank securely while reducing the risk of fuel theft.

This locking filler cap is a premium aftermarket replacement engineered to match the fit, form, and function expected for many vehicles that originally used ACDelco components. Built to provide a reliable seal and simple operation, the cap combines a durable threaded design with an integrated lock mechanism so you can protect fuel and maintain proper pressurization without compromising convenience.

How does this cap keep fuel safe and secure?

The GT376 uses a keyed lock to deter unauthorized opening and a precision-threaded closure to maintain a tight seal. That combination prevents casual tampering and helps preserve the vehicle’s fuel system integrity by limiting contamination and evaporation.

• Keyed lock mechanism to restrict access
• Threaded cap design for a consistent, tight seal
• Durable materials resist corrosion and wear
• OEM-style fit reduces risk of leaks or pressure issues

Will it fit my vehicle and match OEM performance?

The GT376 (84308352) is manufactured to meet original-equipment expectations for fit and function, making it a reliable substitute for many vehicles that specify ACDelco-style caps. Confirm compatibility by matching the part number and thread pattern to your vehicle’s fuel filler specifications.

• Produced to OEM tolerances for proper installation
• Replacement for vehicles using the same ACDelco-style cap
• Check part number 84308352 or GT376 against your VIN/specs
• Simple installation—screw-in design requires no special tools

What are the maintenance and durability benefits?

Designed as a professional-grade aftermarket part, this cap offers dependable sealing performance over time. Its materials and construction minimize common wear issues so you can expect consistent operation and fewer replacements compared with low-quality alternatives.

• Resistant to fuel and environmental exposure
• Maintains a reliable seal to reduce vapour loss
• Locking feature retains functionality after repeated use
• Manufactured to reduce fitment and leak-related service visits

How easy is it to use and install?

Installation is straightforward—unscrew the old cap and thread the GT376 into place until it seats; lock or unlock with the supplied key. Routine use requires only turning the key for security and rotating the cap for normal fueling.

• Screw-in, threaded installation—no specialized tools
• Keyed lock for one-handed locking and unlocking
• Designed for quick serviceability during refueling
• Clear engagement feel when cap is properly seated

Who is this for? The GM Genuine Parts GT376 (84308352) locking fuel tank filler cap is ideal for vehicle owners who want an OEM-compatible replacement that adds theft deterrence without sacrificing sealing performance. It suits mechanics, fleet managers, and private drivers seeking a durable, professional-grade fuel cap that aligns with original equipment standards and simplifies maintenance while protecting fuel assets.