Gates 31318 Fuel Tank Cap

Gates 31318 Locking Fuel Cap Overview

The Gates 31318 Regular Locking Fuel Cap is a direct-fit fuel tank cap built to meet OEM specifications and federal and state emission requirements. It uses a two-way pressure relief and vacuum relief design to let the tank breathe while helping contain fuel vapors.

For drivers searching for a locking fuel cap for a fuel tank cap replacement, this Gates fuel cap is a practical OE-style solution for maintaining proper sealing and vapor control. It is also a relevant choice for common automotive fuel system service needs on vehicles such as Honda Civic and Ford F-150 applications where the correct thread pattern and cap style are required.

Key Features

• Lockable regular fuel cap design for added fuel tank security
• Two-way pressure relief and vacuum relief valve
• Helps the fuel tank breathe while limiting fuel vapor escape
• Built to meet OEM specifications
• Supports federal and state emission requirements
• 3.5" x 5.5 NS thread diameter
• 4-inch shell diameter and 1.5-inch depth
• Thermal relief rated at 255 degrees F

Product Details

Gates Regular Locking Fuel Cap part number 31318 is engineered as a replacement fuel tank cap for applications that require a lockable cap with the correct thread form and sealing profile. The thermal relief venting helps manage tank pressure changes, while the vacuum relief function supports normal fuel system breathing. This makes the Gates 31318 a solid option when replacing a worn, missing, or non-sealing cap on vehicles that call for this specific regular fuel cap design.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Solve

• Loose or damaged fuel cap sealing
• Fuel vapor leakage concerns
• Check-engine light issues related to cap sealing faults
• Loss of fuel tank pressure control
• Need for a locking replacement fuel cap with the correct thread size

Installation Notes and Tips

Verify the thread diameter, shell diameter, and cap depth before installation. Match the cap style to the vehicle’s original fuel tank opening and confirm the locking function engages smoothly. For fitment-based searches, this Gates 31318 fuel cap is commonly researched for fuel tank cap replacement on Honda Civic and Ford F-150 applications, but final selection should follow the vehicle’s required cap specifications.

Quality Assurance

Gates states that this locking fuel tank cap meets OEM specifications and emission requirements, with a pressure and vacuum relief design intended to support proper fuel system operation.