Gates 31671 Fuel Tank Cap

Gates 31671 Regular Locking Fuel Cap

The Gates 31671 Regular Locking Fuel Cap is a direct-fit fuel tank cap for older import and domestic applications that require emission-controlled venting and a lockable closure. It is built to meet OEM specifications and supports the fuel system’s pressure and vacuum balance while helping reduce fuel vapor escape.

Key Features

• Lockable fuel cap for added fuel tank security
• Emission control venting with two-way pressure relief and vacuum relief
• Regular fuel cap design for standard filler neck applications
• Shallow cam construction for proper engagement
• Thread diameter: 1.38 in.; shell diameter: 2.63 in.; depth: 2.09 in.
• Gates 31671 fuel cap built to meet OEM specifications and emission requirements

Product Details

This Gates Regular Locking Fuel Cap is engineered for vehicles that need a secure, emission-controlled replacement cap rather than a generic universal part. The locking design helps secure the fuel tank opening, while the pressure relief and vacuum relief valve allows the tank to breathe during normal operation and helps limit fuel fumes from escaping. The Gates 31671 is a practical replacement for older Toyota Land Cruiser, Toyota Pickup, Nissan 720, Nissan Maxima, Dodge Ram 50, and Mitsubishi Montero applications where the correct cap style and venting matter.

This part cross-references Wix 46322 and Dorman - Conduct-Tite 84783 for the same application.

Common Problems This Part Can Address

• Loose, damaged, or missing fuel cap
• Fuel vapor odor around the filler neck
• Check engine or emission-related fuel cap concerns on older vehicles
• Difficulty maintaining proper tank pressure or vacuum balance
• Fuel theft concerns on vehicles with a locking cap requirement

Installation Notes and Tips

Verify filler neck thread diameter, cam style, and cap depth before installation. This cap uses a shallow cam profile and a 1.38-inch thread diameter, so matching the original cap dimensions is important for proper sealing and locking action. Confirm vehicle-specific fitment for your year, make, and model before ordering. Fits 1978-1984 Toyota Land Cruiser, N/A; Fits 1987-1989 Toyota Land Cruiser, N/A; Fits 1980-1986 Nissan 720, N/A; Fits 1982-1984 Nissan Maxima, N/A; Fits 1983-1984 Mitsubishi Montero, N/A; Fits 1983-1984 Dodge Ram 50, N/A.

Quality Assurance

Gates manufactures this locking fuel tank cap to OEM specifications and to meet Federal and State emission requirements. The emission-control venting and two-way relief valve design support consistent fuel system operation in the listed applications.