Rig Tough 6408001 is a fuel-resistant rubber O-ring that seals the cap-to-fillneck joint on Peterbilt fuel tanks, preventing vapor leaks, evaporation, and moisture ingress. It is a direct aftermarket replacement for Peterbilt 490-89 and crosses to Automann 572.1014.1 and Newstar S-21251, fitting both locking and non-locking Peterbilt cap variants across a wide model range. Signs You Need a New Fuel Cap O-Ring Fuel odor around the tank or cab area Visible fuel seepage around the cap Check engine light due to EVAP-style leak codes Cracked, hardened, or flattened existing O-ring Specifications Manufacturer Rig Tough Part Number 6408001 Part Type Fuel Cap O-Ring / Gasket Material Fuel-Resistant Rubber Color Black Quantity 1 per package Cross References This O-ring replaces or is equivalent to the following part numbers: Peterbilt: 490-89, 49089 Automann: 572.1014.1 Newstar: S-21251 Compatible Fuel Caps Peterbilt: 11-04859-100, 11-04859-200 Rig Tough: 6405001, 6405002 Automann: 572.1014, 572.1015 Other: FTC002, FTC002L Applications This fuel cap O-ring fits the following Peterbilt models: Peterbilt 359 (1972-1987), 362 (1981-2000), 377 (1987-2000), 378 (1987-2007), 379 (1987-2007) Peterbilt 384 (2008-2015), 385 (2000-2007), 386 (2006-2016), 387 (1999-2010), 388 (2008-2014), 389 (2008-Up) Peterbilt 330 (1995-2010), 335 (1995-2010), 337 (2011-2016), 340 (2007-2011), 348 (2011-2016) Peterbilt 357 (1987-2007), 365 (2007-2017), 367 (2007-2017), 375 (1989-1995) Peterbilt 567 (2014-Up), 579 (2013-Up), 587 (2011-2016) Verify your fuel cap part number before ordering to confirm fitment.
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