Gates 31783 Fuel Tank Cap

Locking Fuel Cap for Honda and Acura

The Gates 31783 Regular Locking Fuel Cap is a threaded replacement fuel tank cap built for select Honda, Acura, Ford, Jaguar, Mercury, and Volkswagen applications. It is made to meet OEM specifications and emission requirements while helping seal the fuel system with a lockable design.

Gates Regular Locking Fuel Cap line focuses on direct-fit fuel tank caps with emission control venting and pressure management. This cap uses a two-way pressure relief and vacuum relief valve to let the tank breathe while helping reduce fuel vapor escape.

Key Features

• Part number: 31783
• Lockable regular fuel cap design
• Threaded cam type for select threaded filler neck applications
• Emission control venting
• Two-way pressure relief and vacuum relief valve
• Meets OEM specifications and Federal and State emission requirements
• Shell diameter: 2.91 in.
• Thread diameter: 1.77 in.
• Depth: 2.56 in.

Detailed Description

This Gates fuel tank cap is built for drivers replacing a worn, missing, or damaged locking cap on vehicles such as the Honda Civic, Honda CR-V, Acura MDX, and Acura TL. The threaded, lockable design helps secure the fuel filler opening, while the emission-control construction supports proper tank breathing and vapor containment. Part number 31783 is also referenced in fuel system catalogs for select Ford Focus, Jaguar X-Type, and Volkswagen Beetle applications.

This part cross-references Four Seasons 35070 for the same application.

Common Issues It May Solve

• Check engine light related to a loose or failing fuel cap
• Fuel vapor odor around the fuel filler area
• Damaged or missing locking fuel cap
• Improper sealing at the threaded filler neck
• Emission test failures caused by cap sealing problems

Installation Notes and Tips

• Confirm the vehicle uses a threaded filler neck before ordering.
• Match the cap to the listed year, make, and model exactly.
• Inspect the filler neck threads and sealing surface for wear or damage before installation.
• After installation, tighten the cap until it seats securely and locks as applicable.
• For fitment, this cap is listed for applications including Fits 2006-2011 Honda Civic, N/A; Fits 2005-2011 Honda CR-V, N/A; Fits 2005-2011 Acura MDX, N/A; Fits 2006-2011 Acura TSX, N/A; Fits 2000-2004 Ford Focus, N/A.

Quality Assurance

Gates manufactures this locking fuel cap to meet OEM specifications and emission requirements, with pressure and vacuum relief built into the cap design for controlled tank ventilation.