Gates 31646 Fuel Tank Cap

OE Equivalent Fuel Cap for Classic GM and Mopar Applications

Gates 31646 is an OE Equivalent Fuel Tank Cap built for older vehicles that need a direct-style replacement with the correct fit and venting profile. It is designed for shallow cam filler necks and is vented anti-surge, making it a practical choice for restoring proper fuel system sealing on select Buick, Chevrolet, Chrysler, Cadillac, Ford, Lincoln, Mercury, Oldsmobile, and Pontiac models.

The Gates OE Equivalent Fuel Cap line focuses on rugged construction and OE-level performance. This Gates 31646 fuel cap is made to meet or exceed OEM specifications and is engineered for both shallow and deep cam filler neck designs across vented, non-vented, and vented anti-surge applications.

Key Features

• OE Equivalent Fuel Tank Cap from Gates
• Part number: 31646
• Vented anti-surge design
• Shallow cam filler neck fitment
• Thread diameter: 1.38 in.
• Shell diameter: 2.19 in.
• Depth: 1.25 in.
• Lockable: No
• OE Performance comparison rating

Detailed Description

Gates 31646 is a replacement fuel cap for classic vehicles that require an OE-style vented anti-surge cap. It is built with heavy-duty construction and sized for shallow cam filler necks, helping maintain the intended fuel tank sealing and venting behavior on the applications listed below. This part cross-references Stant 10646 for the same application.

Fits 1970 Chevrolet Camaro, N/A; Fits 1964-1969 Chevrolet Impala, N/A; Fits 1961-1969 Lincoln Continental, N/A; Fits 1965-1969 Pontiac Bonneville, N/A; Fits 1957-1965 Chrysler 300, N/A. Additional coverage includes select Buick LeSabre, Cadillac Eldorado, Ford Thunderbird, Mercury Montego, Oldsmobile Cutlass, and Pontiac Catalina applications.

What This Fuel Cap Helps Address

• Fuel odor caused by a worn or poorly sealing cap
• Incorrect venting on vehicles that require a vented anti-surge design
• Loose fitment from an aging or damaged original cap
• Fuel tank sealing issues on shallow cam filler necks
• Replacement needs for restoration or maintenance on classic GM and Mopar vehicles

Installation Notes and Tips

Verify filler neck style before ordering, since this cap is specified for shallow cam filler necks. Confirm the vehicle’s emission configuration and application notes, especially for listings marked without California emission systems or wagon-specific coverage. Compare the original cap dimensions and venting style to the Gates 31646 before installation.

Quality Assurance

Gates OE Equivalent Fuel Caps are built to meet or exceed OEM specifications and are intended to deliver OE-level performance. The rugged construction and application-specific venting design support consistent replacement quality for restoration and repair work.