Gates 31780 Fuel Tank Cap

Gates 31780 Regular Locking Fuel Cap

The Gates 31780 locking fuel cap is built for vehicles that need a threaded, emission-control fuel tank cap with secure locking protection. It is a regular fuel cap application that helps maintain proper tank sealing while supporting the fuel system’s pressure and vacuum relief function.

Key Features

• Lockable design for added fuel cap security
• Regular fuel cap style with threaded cam type
• Emission control venting to support evaporative emissions requirements
• Two-way pressure relief and vacuum relief valve for tank breathing
• Built to meet OEM specifications and federal and state emission requirements
• Thread diameter: 1.77 in.; shell diameter: 2.91 in.; depth: 2.48 in.

Product Details

Gates Regular Locking Fuel Cap 31780 is made for a wide range of import and domestic vehicles, including Mazda CX-5, Subaru Outback, Honda Civic, Toyota Camry, and Nissan Altima applications. The threaded design helps ensure a secure seal on the filler neck, while the emission-control valve allows the fuel tank to breathe without releasing fuel fumes. This makes it a practical replacement for worn, missing, or damaged locking fuel tank caps on vehicles that require a regular locking fuel cap.

The Gates Regular Locking Fuel Cap line is focused on OE-style fuel system service parts for vehicles that need correct sealing, venting, and locking function. For shoppers searching by application, this part number 31780 is commonly referenced for Mazda, Subaru, Honda, Toyota, Nissan, Chevrolet, GMC, Acura, Lexus, and other listed fitments.

This part cross-references Wix 46368 for the same application.

What It Helps Solve

• Loose or damaged fuel cap sealing
• Fuel vapor odor from a failing cap seal
• Check engine light concerns related to evaporative emissions faults
• Missing or non-locking fuel cap security
• Improper tank venting caused by a worn cap valve

Installation Notes and Tips

Confirm the filler neck style before ordering, especially on vehicles noted with threaded filler neck requirements. Match the cap to the vehicle’s year, make, and model exactly as listed in the fitment data. After installation, tighten the cap until it seats securely and verify that the locking function engages properly.

Quality Assurance

Gates states that this fuel cap meets OEM specifications and federal and state emission requirements. The two-way pressure relief and vacuum relief design is intended to support proper fuel tank operation while helping control fuel vapor escape.