Gates 31659 Fuel Tank Cap

Regular Locking Fuel Cap for Select Toyota and Jeep Models

The Gates 31659 Regular Locking Fuel Cap is a direct-fit fuel tank cap built for select Toyota, Jeep, and Volkswagen applications. It combines locking security with emission-control venting to help maintain proper tank pressure while limiting fuel vapor escape.

Key Features

• Lockable fuel cap for added theft deterrence
• Regular fuel cap design with shallow cam profile
• Emission-control venting with two-way pressure relief and vacuum relief
• Built to meet OEM specifications and federal and state emission requirements
• Thread diameter: 1.38 in.; shell diameter: 3.25 in.; depth: 2.09 in.

Product Details

Gates Regular Locking Fuel Cap 31659 is engineered for vehicles that require a locking, emission-controlled fuel tank cap. The cap’s two-way valve helps the fuel tank breathe during normal operation while reducing the release of fuel fumes. This makes it a practical replacement for aging or damaged caps on vehicles such as the Toyota Corolla, Toyota Celica, Jeep CJ5, Jeep Wrangler, and Volkswagen Jetta. This part cross-references Wix 46318 for the same application.

The Gates 31659 fuel cap line is focused on OE-style replacement coverage for older import and light truck applications, with fitment spanning 1971-1993 model years across Toyota, Jeep, and Volkswagen platforms.

What It Helps Solve

• Loose, worn, or non-locking fuel cap replacement needs
• Fuel vapor odor caused by a failing cap seal or vent function
• Check-engine or emissions-related issues tied to improper tank venting
• Fuel tank pressure irregularities from a cap that no longer holds vacuum or pressure correctly
• Security concerns on vehicles that use a locking fuel cap

Installation Notes and Tips

Verify the thread diameter, shell diameter, and cam style before installation. Confirm the vehicle’s original cap is a regular locking fuel cap with shallow cam design and emission-control venting. For best results, inspect the filler neck and sealing surface for damage or corrosion before installing the new cap. Fits 1971-1979 Toyota Corolla, N/A; Fits 1971-1973 Toyota Corolla, N/A; Fits 1972-1978 Toyota Corona, N/A; Fits 1973-1977 Toyota Celica, N/A; Fits 1978-1979 Toyota Cressida, N/A; Fits 1977-1983 Jeep CJ5, N/A; Fits 1977-1986 Jeep CJ7, N/A; Fits 1978-1983 Jeep Cherokee, N/A; Fits 1978-1983 Jeep J10, N/A; Fits 1978-1983 Jeep J20, N/A; Fits 1978-1983 Jeep Wagoneer, N/A; Fits 1980-1984 Volkswagen Jetta, N/A; Fits 1980-1984 Volkswagen Rabbit Convertible, N/A; Fits 1981-1985 Jeep Scrambler, N/A; Fits 1985-1993 Volkswagen Cabriolet, N/A; Fits 1987-1990 Jeep Wrangler, N/A.

Quality Assurance

Gates manufactures this locking fuel tank cap to meet OEM specifications and emission requirements for the listed applications. The design uses emission-control venting and pressure/vacuum relief to support proper fuel system operation.