Gates 31782 Fuel Tank Cap

Gates Regular Locking Fuel Cap 31782

The Gates Regular Locking Fuel Cap 31782 is a direct replacement fuel tank cap built to meet OEM specifications and Federal and State emission requirements. It uses a two-way pressure relief and vacuum relief valve to let the fuel tank breathe while helping control fuel vapor escape.

For drivers servicing a Saturn Ion, Chevrolet Blazer, or Pontiac Grand Prix, this locking fuel cap provides a practical OE-style solution for emission control and fuel system sealing. The Gates 31782 is a regular fuel cap with a quick-on cam design and lockable construction.

Key Features

• Lockable fuel cap for added security
• Regular fuel cap design with Quick-On cam type
• Emission control venting to support fuel tank breathing
• Two-way pressure relief and vacuum relief valve
• Built to meet OEM specifications
• Thread diameter: 1.56 in.
• Shell diameter: 2.91 in.
• Depth: 2.48 in.

Product Details

Gates Regular Locking Fuel Cap 31782 is engineered for vehicles that use a locking, emission-controlled fuel tank cap. The cap’s venting design helps maintain proper tank pressure while limiting fuel fumes from escaping, which is important for drivability and emissions compliance. This part cross-references Monroe Shocks & Struts 5504 for the same application.

Compatible With 1996-2005 Chevrolet Blazer, 1997-2005 Pontiac Grand Am, and 2003-2006 Saturn Ion, this fuel cap also serves many Buick, Cadillac, GMC, Oldsmobile, Isuzu, and Saturn applications listed in the fitment data. The Gates 31782 part number is also referenced across multiple aftermarket catalogs for matching fuel cap applications.

Common Issues This Part Can Address

• Loose or damaged fuel cap sealing
• Fuel vapor odor around the filler area
• Emission system fault codes related to cap sealing
• Difficulty maintaining proper tank pressure or vacuum relief
• Worn locking mechanism on the original cap

Installation Notes and Tips

Verify the thread diameter, shell diameter, and cam style before installation. Confirm the vehicle uses a regular locking fuel cap with emission control venting and a Quick-On cam type. For fitment-specific applications, check the filler neck design and any notes such as the Saturn Vue listing with a metal filler door. After installation, tighten the cap until it seats securely and confirm the lock engages properly.

Quality Assurance

Gates manufactures this fuel cap to meet OEM specifications and emission requirements for the listed applications. The pressure relief and vacuum relief valve design supports proper fuel tank operation while maintaining emission control performance.