Gates 31844 Fuel Tank Cap

Gates 31844 Regular Locking Fuel Cap

The Gates 31844 Regular Locking Fuel Cap is a direct replacement fuel tank cap built to meet OEM specifications and emission requirements. It uses a two-way pressure and vacuum relief design to let the tank breathe while helping contain fuel vapors.

Compatible With select Chevrolet, GMC, Cadillac, Buick, Pontiac, Saturn, and other GM-platform vehicles, this locking fuel cap is a practical service part for restoring proper tank sealing and secure closure.

Key Features

• Lockable design for added fuel cap security
• Pressure/vacuum venting helps maintain normal tank breathing
• Regular fuel cap style for OE-style replacement use
• Quick-On cam type for proper cap engagement
• Built to meet OEM specifications and Federal and State emission requirements
• Part number 31844 for easy identification

Product Details

This Gates Regular Locking Fuel Cap is engineered for vehicles that use a 1.56-inch thread diameter and a 2.68-inch shell diameter. The pressure vacuum venting design supports fuel system operation by balancing tank pressure while limiting vapor escape. Gates 31844 is a strong match for drivers replacing a worn, missing, or damaged locking gas cap on applications such as Chevrolet Impala, Chevrolet Silverado, GMC Sierra, and Cadillac Escalade.

This part cross-references Stant 10511 and Wix 46375 for the same application.

Common Problems This Part Can Help Solve

• Fuel cap warning light caused by a poor seal
• Fuel vapor odor around the filler area
• Loose, damaged, or missing locking gas cap
• Evaporative emissions faults related to cap sealing
• Difficulty maintaining proper tank pressure or vacuum balance

Installation Notes and Tips

Verify the filler neck style before ordering, especially on applications noted as without a threaded filler neck or with a plastic filler door. Confirm the cap style, thread diameter, and cam type against the original part. After installation, tighten the cap until it seats securely and check that the locking function operates smoothly.

Quality Assurance

Gates designs this fuel tank cap to meet OEM specifications and emission-related requirements for the listed applications. The pressure/vacuum relief valve design supports proper tank ventilation while helping control fuel fumes.