Gates 31734D Fuel Tank Cap

Diesel fuel cap for late-model applications

The Gates 31734D Diesel Only Pre-Release Locking Fuel Cap is built for diesel fuel systems that use a Quick-On style cap with pressure-vacuum venting. Its green color identifies diesel-only use, while the locking design adds an extra layer of fuel-tank security for the vehicles listed below.

Gates 31734D is a diesel fuel tank cap for specific late-model and legacy trucks, vans, and SUVs, including Chevrolet Express, GMC Savana, Ford F-Series diesel applications, and selected Dodge Ram models. This part number is also referenced as Gates 31734D for direct replacement matching.

Key features

• Diesel Only Pre-Release Locking Fuel Cap
• Lockable design for added fuel-tank security
• Quick-On cam type for proper cap engagement
• Pressure-vacuum venting to maintain tank operation
• Green cap color for diesel-only identification
• 1.77 in thread diameter, 2.75 in shell diameter, 2.375 in depth

Detailed product description

This Gates fuel tank cap is designed around the needs of diesel-equipped vehicles that require a pre-release locking cap with pressure-vacuum venting. The Quick-On cam style helps the cap seat correctly on the filler neck, while the locking feature supports fuel security on applications such as Chevrolet Express 2500 and 3500, GMC Savana 2500 and 3500, Ford F-250 Super Duty, Ford F-350 Super Duty, and other listed diesel models. The green finish provides a clear diesel-only visual cue, and the cap’s dimensions are specified for the listed fitments.

This part cross-references 17501D and 35064D for the same application.

What this fuel cap helps address

• Loose, damaged, or missing diesel fuel cap
• Fuel tank sealing issues caused by worn cap components
• Fuel vapor control concerns related to pressure-vacuum venting
• Unauthorized access to the fuel tank
• Incorrect cap identification on diesel-only vehicles

Installation notes and tips

Verify the filler neck style and vehicle application before installation. This cap is listed for Quick-On cam type filler necks and diesel-only applications, including many Chevrolet, GMC, Ford, Dodge, Jeep, Toyota, Volvo, and Cadillac models across the 1978-2013 range. Confirm the cap seats fully and locks securely after installation. For fitment-specific searches, this part is commonly selected for Chevrolet Express 3500, GMC Savana 3500, and Ford F-250 Super Duty diesel applications.

Quality assurance

Gates manufactures this fuel cap as a direct-fit replacement part for the listed applications. The design follows the specified diesel-only, locking, and venting requirements for the part number 31734D.