Gates 31844Y Fuel Tank Cap

Gates Flex Fuel Locking Fuel Cap

The Gates Flex Fuel Regular Locking Fuel Cap is a direct replacement fuel tank cap for select GM flex-fuel applications. It features a yellow cover with E85 identification to help remind drivers that the vehicle can run on gasoline or E-85 ethanol. Part number 31844Y is built for vehicles that use a quick-on, vacuum-only cap design.

Key Features

• Brand: Gates
• Part Number: 31844Y
• Yellow flex-fuel cap with E85 designation
• Lockable design for added fuel tank security
• Quick-On cam type
• Vacuum-only venting
• Thread diameter: 1.56 in.
• Shell diameter: 2.69 in.
• Depth: 2.53 in.

Product Details

This Gates fuel tank cap is part of the Flex Fuel Regular Locking Fuel Cap line, created for vehicles that use flex-fuel fueling systems. The yellow top and E85 marking provide a clear visual cue at the fuel door, while the locking design helps secure the tank opening. Gates 31844Y is listed for a wide range of Chevrolet, GMC, and Cadillac models, including Chevrolet Impala, Malibu, Silverado, Tahoe, GMC Sierra, Yukon, and Cadillac Escalade applications.

This part cross-references Stant 10511Y for the same application.

What It Helps Address

• Missing or damaged fuel tank cap
• Fuel vapor leakage from a worn cap seal
• Check engine light concerns related to cap sealing
• Loss of proper tank closure on quick-on filler necks
• Need for a locking flex-fuel cap with clear E85 identification

Installation Notes and Tips

Confirm the vehicle uses a quick-on, vacuum-only fuel cap design before ordering. This cap is listed for select 2004-2014 Chevrolet, GMC, and Cadillac models, with fitment varying by filler neck configuration; some applications note use without a threaded filler neck. Match the year, make, model, and notes exactly to the vehicle listing for proper fitment. Gates 31844Y is commonly searched as a replacement fuel cap for Chevrolet Silverado 1500, GMC Sierra 1500, and Chevrolet Tahoe flex-fuel applications.

Quality Assurance

Gates is a recognized name in automotive air and fuel delivery components. This Flex Fuel Regular Locking Fuel Cap is built to match the listed fitment and design requirements for select GM flex-fuel vehicles.