Gates 31860 Fuel Tank Cap

Gates 31860 Regular Locking Fuel Cap

The Gates 31860 is a regular locking fuel cap built for vehicles that need a secure, OE-style replacement fuel tank cap. It is a pressure/vacuum vented design that helps the fuel tank breathe while limiting fuel vapor escape, and it meets OEM specifications along with Federal and State emission requirements.

Key Features

• Lockable fuel cap for added fuel tank security
• Regular fuel cap design with Quick-On cam type
• Pressure/vacuum venting for controlled tank breathing
• Thread diameter: 1.56 in.
• Shell diameter: 2.69 in.
• Depth: 2.22 in.
• Built to meet OEM specifications and emission requirements

Product Details

This Gates fuel tank cap is engineered for direct replacement use on a range of GM vehicles, including Buick Lucerne, Cadillac STS, Chevrolet Express 1500, Chevrolet Express 2500, Chevrolet Express 3500, Chevrolet HHR, GMC Envoy, Pontiac G6, Pontiac Solstice, Chevrolet Uplander, Pontiac G3, GMC Envoy XL, and GMC Envoy XUV. The Gates Regular Locking Fuel Cap line focuses on secure closure, proper venting, and fitment that matches the original cap style for the listed applications. Part number 31860 is also cross-referenced with Stant 10523 for the same application.

What It Helps Solve

• Loose, damaged, or missing fuel cap issues
• Fuel vapor leakage from a worn cap seal or venting problem
• Check engine light concerns related to evaporative emissions faults
• Difficulty maintaining proper fuel tank pressure and vacuum balance
• Fuel system contamination from an unsecured tank opening

Installation Notes and Tips

Verify the cap style, thread diameter, and venting design before installation. This part uses a Quick-On cam type and a locking design, so confirm the original cap matches those features. For fitment, use the vehicle-specific applications listed for 2005-2011 models, including Fits 2006-2011 Chevrolet HHR, Fits 2006-2011 Buick Lucerne, and Fits 2005-2009 Pontiac G6. Part number 31860 should be matched to the fuel filler neck and original cap configuration before final installation.

Quality Assurance

Gates states that this locking fuel tank cap meets OEM specifications and Federal and State emission requirements. The pressure/vacuum relief valve is designed to support proper tank breathing while limiting fuel fumes from escaping.