Gates 31838Y Fuel Tank Cap

Flex Fuel Fuel Cap for OE-Style Service

The Gates 31838Y Flex Fuel Regular Fuel Cap is a yellow, pressure-vacuum fuel tank cap built for vehicles that can run gasoline or E85 ethanol. The bright yellow cover and E85 designation make the fuel type easy to identify during refueling and routine service.

Compatible with a wide range of Dodge, Chrysler, Jeep, Ram, Nissan, and Volkswagen applications, this Gates fuel cap is a direct-fit service part for many flex-fuel vehicles, including Dodge Grand Caravan, Ram 1500, and Jeep Cherokee applications.

Key Features

• Gates Flex Fuel Regular Fuel Cap, part number 31838Y
• Yellow plastic cover with E85 identification
• Pressure-vacuum venting for fuel system sealing
• Quick-On cam type for straightforward cap engagement
• Non-lockable design
• Shell diameter: 2.78 in; thread diameter: 1.78 in; depth: 2.41 in

Product Details

Gates 31838Y is a flex fuel fuel tank cap designed for vehicles equipped for gasoline and E85 use. The yellow cap color and E85 marking provide a clear visual reminder at the fuel door, while the pressure-vacuum venting helps maintain proper tank sealing during normal operation. This part cross-references Stant 10838Y for the same application.

Use this cap on confirmed fitments such as 2015-2020 Dodge Grand Caravan, 2011-2018 Ram 1500, and 2017-2018 Jeep Cherokee. It also fits other listed Chrysler, Dodge, Jeep, Ram, Nissan, and Volkswagen models across the 1999-2020 model years. The Gates 31838Y is a practical replacement when the original fuel cap is worn, missing, or no longer sealing correctly.

What This Fuel Cap Helps Address

• Fuel vapor leaks caused by a damaged or loose cap
• Check engine light concerns related to poor fuel tank sealing
• Difficulty identifying a flex-fuel vehicle at the fuel door
• Worn cam engagement that prevents a secure cap fit
• Replacement needs for a missing or cracked fuel tank cap

Installation Notes and Tips

Verify the vehicle’s fuel door and cap style before ordering, especially on flex-fuel applications. Match the quick-on cam design, venting style, and dimensions to the original cap for proper fitment. After installation, tighten the cap until it seats securely and confirm that the fuel door closes normally.

Fits 2015-2020 Dodge Grand Caravan, N/A; 2011-2018 Ram 1500, N/A; 2017-2018 Jeep Cherokee, N/A; and other listed flex-fuel applications including Dodge Challenger, Chrysler Town & Country, and Ram ProMaster models.

Quality Assurance

Gates is a recognized name in automotive fuel system hardware, and this cap is built to meet the fit and function expected for OE-style replacement service on listed applications.