Gates 31781 Fuel Tank Cap

Gates 31781 Regular Locking Fuel Cap

The Gates 31781 Regular Locking Fuel Cap is a threaded, lockable fuel tank cap built for select Audi and Volkswagen applications. It is made to meet OEM specifications and emission requirements while helping maintain proper tank pressure control.

Key Features

• Lockable regular fuel cap for added fuel system security
• Two-way pressure relief and vacuum relief valve helps the fuel tank breathe
• Threaded cam type for a secure fit
• Vacuum-only venting configuration
• Measures 1.77 in. thread diameter and 2.91 in. shell diameter
• Built to meet Federal and State emission requirements

Product Details

Gates Regular Locking Fuel Cap part number 31781 is designed for vehicles that use a threaded locking fuel tank cap with vacuum-only venting. The cap’s pressure relief and vacuum relief function helps manage tank breathing while limiting fuel vapor escape. This makes it a practical replacement for aging or damaged caps on Audi A4, Audi A6, Audi TT, Volkswagen Jetta, Volkswagen Golf, and related models.

This part cross-references Four Seasons 35068 and Wix 46369 for the same application. It is also listed under Gates 31781 for direct replacement reference.

What It Helps Solve

• Loose or damaged fuel cap sealing
• Fuel vapor odor from a worn cap seal
• Check engine light concerns related to evaporative emissions faults
• Difficulty maintaining proper fuel tank pressure
• Security concerns on vehicles using a locking fuel cap

Installation Notes and Fitment

Before ordering, confirm the cap style, thread diameter, and venting setup match your original part. Compatible With 2011-2013 Volkswagen Jetta, N/A; 2009 Volkswagen Jetta, N/A; 2006 Volkswagen Jetta, N/A; 1985-2001 Volkswagen Jetta, N/A; 2010-2011 Audi A3, N/A; 2010-2011 Audi A3 Quattro, N/A; 2006-2010 Audi A8 Quattro, N/A; 1997-2003 Audi A8 Quattro, N/A; 2008-2010 Audi R8, N/A; 2010 Audi S3, N/A; 2007-2009 Audi S8, N/A; 2001-2003 Audi S8, N/A; 2009 Volkswagen Bora, N/A; 2009 Volkswagen Jetta City, N/A; 2000-2008 Audi TT Quattro, N/A; 2006-2007 Volkswagen Golf, N/A; 1985-2004 Volkswagen Golf, N/A; 2007 Volkswagen Golf City, N/A; 2007 Volkswagen Touareg, N/A; 2005 Volkswagen Touareg, N/A; 2006 Audi TT, N/A; 2000-2004 Audi TT, N/A; 2006 Volkswagen GTI, N/A; 2004-2005 Volkswagen Beetle, N/A; 2004-2005 Volkswagen Golf, N/A; 2002-2005 Volkswagen Jetta, N/A; 1990-2005 Volkswagen Passat, N/A; 2003-2004 Audi A6, N/A; 2003-2004 Audi A6 Quattro, N/A; 2004 Audi A8 Quattro, N/A; 2004 Audi S6, N/A; 2001-2002 Audi S6, N/A; 2004 Volkswagen R32, N/A; 1996-2003 Audi A4, N/A; 1996-2003 Audi A4 Quattro, N/A; 2003 Audi Allroad Quattro, N/A; 2003 Audi S6, N/A; 1998-2003 Volkswagen Beetle, N/A; 1999-2003 Volkswagen EuroVan, N/A; 1997 Volkswagen EuroVan, N/A; 1995-2002 Audi A6, N/A; 1995-2002 Audi A6 Quattro, N/A; 2001-2002 Audi Allroad Quattro, N/A; 2000-2002 Audi S4, N/A; 1992-1994 Audi S4, N/A; 1995-2002 Volkswagen Cabrio, N/A; 1997-2000 Audi A8, N/A; 1994-1998 Audi Cabriolet, N/A; 1995-1996 Audi S6, N/A; 1995-1996 Volkswagen Derby, N/A; 1993-1995 Audi 90, N/A; 1988-1991 Audi 90, N/A; 1993-1995 Audi 90 Quattro, N/A; 1988-1991 Audi 90 Quattro, N/A; 1990-1994 Audi 100, N/A; 1990-1994 Audi 100 Quattro, N/A; 1991-1994 Audi V8 Quattro, N/A; 1990-1994 Volkswagen Corrado, N/A; 1988-1992 Audi 80, N/A; 1988-1992 Audi 80 Quattro, N/A; 1990-1991 Audi 200, N/A; 1990-1991 Audi 200 Quattro, N/A; 1990-1991 Audi Coupe Quattro, N/A.

Quality Assurance

Gates states this locking fuel tank cap meets OEM specifications and Federal and State emission requirements. The two-way pressure relief and vacuum relief valve design supports proper fuel system breathing while helping reduce vapor escape.