Gates 31823 Fuel Tank Cap

Gates 31823 Saddle Tank Locking Fuel Cap

The Gates 31823 Saddle Tank Locking Fuel Cap is built for heavy-duty fuel tank service with solid brass construction and a lockable design. It is a vented saddle tank fuel cap with a female-thread cam style and a 2" x 11.5 NPSM thread size for applications that require this configuration.

For buyers searching for a locking fuel cap for a saddle tank, this Gates fuel tank cap combines metal construction, venting, and a secure threaded fit. It is a practical replacement for select truck and equipment fuel systems where a vented, lockable cap is specified.

Key Features

• Solid brass construction for durable fuel system service
• Lockable design for added fuel tank security
• Vented cap style to support proper tank breathing
• Female-thread cam type
• 2" x 11.5 NPSM thread size
• Chain length: 8.25 in.
• Cross bar length: 3.5 in.
• Includes fuse plug
• Designed as a saddle tank fuel cap

Product Details

Gates Saddle Tank Locking Fuel Cap 31823 is a direct-fit style fuel tank cap for applications that call for a vented, lockable saddle tank design. The solid brass body supports long-term use in demanding automotive and truck environments, while the female-thread configuration and 2" x 11.5 NPSM thread size help ensure the correct threaded engagement where specified. This part cross-references Motorad 2503-11 for the same application.

Use this cap when replacing a worn, missing, or damaged locking fuel cap on a compatible saddle tank setup. Search terms such as locking saddle tank fuel cap, vented brass fuel tank cap, and 2 inch 11.5 NPSM fuel cap all point to this type of replacement part. Gates 31823 is also a relevant search for buyers comparing fuel tank cap options for truck and diesel-style saddle tank systems.

Common Uses

• Replacing a damaged or missing locking fuel cap
• Restoring proper venting at the fuel tank opening
• Addressing fuel odor caused by a poor cap seal
• Correcting a cap that no longer threads on securely
• Servicing saddle tank fuel systems that require a vented brass cap

Installation Notes

Verify the thread size, cam type, and saddle tank configuration before installation. Confirm that the fuel tank opening calls for a 2" x 11.5 NPSM female-thread cap and that the vented design matches the original specification. Check the chain length and cross bar dimensions against the existing setup if the application uses a tethered cap arrangement. For vehicle-specific searches, use terms such as Gates 31823 fuel cap for Ford truck saddle tank applications or locking fuel cap for truck fuel tank service, and confirm the exact fitment requirements for the vehicle.

Quality Assurance

Gates identifies this part as a heavy-duty locking saddle tank fuel cap with metal construction throughout. The solid brass build, vented design, and included fuse plug reflect the product’s intended use in demanding fuel delivery applications. Gates 31823 is also listed under common interchange references including Wix 46346 and BBB Industries 11413.