Gates 31841D Fuel Tank Cap

Diesel Fuel Cap for Ford Super Duty Applications

The Gates 31841D Diesel Only Fuel Cap is built for diesel fuel systems that use a traditional green cap for quick identification at the pump. It is a non-locking, vacuum-only cap with a Quick-On cam design, making it a direct-style replacement for select Ford trucks and vans.

Gates’ Diesel Only Fuel Cap line uses the familiar diesel green cover to match diesel nozzle handles, helping distinguish diesel fill points during refueling. This part number, 31841D, is listed for Ford F-250 Super Duty, Ford F-350 Super Duty, and Ford E-Series diesel applications with the specified filler neck configuration.

Key Features

• Diesel only fuel tank cap with green cover
• Quick-On cam type for straightforward cap engagement
• Vacuum-only venting
• Non-locking design
• Shell diameter: 2.75 in.
• Thread diameter: 1.56 in.
• Depth: 1.91 in.

Detailed Product Information

This Gates fuel tank cap is intended for diesel fuel systems where a green cap is used to identify diesel service points. The 31841D is a direct replacement style cap for select Ford Super Duty trucks and Ford E-350 diesel applications, including 2004-2010 Ford E-350 Super Duty, 2004-2005 Ford E-350 Club Wagon, 2009-2013 Ford F-250 Super Duty, 2015-2016 Ford F-250 Super Duty, 2009-2013 Ford F-350 Super Duty, and 2015-2016 Ford F-350 Super Duty. It also lists 2008 Ford F-250 Super Duty and 2008 Ford F-350 Super Duty with notes for vehicles without a threaded filler neck.

This part cross-references Stant 10840D for the same application.

Common Issues This Part Can Address

• Missing or damaged diesel fuel cap
• Cap that no longer seals properly at the filler neck
• Incorrect cap color on a diesel fuel system
• Fuel tank opening left exposed to dirt and debris
• Refueling confusion on diesel-only vehicles

Installation Notes and Tips

Verify filler neck style before ordering, especially on 2008 Ford F-250 Super Duty and 2008 Ford F-350 Super Duty models noted without a threaded filler neck. Confirm the cap matches the vehicle’s diesel-only application and compare the existing cap dimensions and cam style to the specifications listed for Gates 31841D. For best results, inspect the filler neck sealing surface before installation.

Quality Assurance

Gates is a recognized name in automotive fuel system hardware, and this diesel fuel cap is cataloged with OE-style interchange references for select Ford diesel applications. Part number 31841D is listed with direct fitment data for specific Ford F-250 Super Duty, Ford F-350 Super Duty, and Ford E-Series models.