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03-37017-00 Diesel Fuel Cap — a robust, non-locking, non-vented 1/4-turn replacement crafted from aluminum for durability in heavy-duty trucks and tractors.

• Construction: Aluminum fuel cap built to withstand harsh trucking environments.
• Operation: Non-vented, non-locking design with quick 1/4-turn action for fast fueling.
• Chain & Bail: Includes an 8.00" chain and 6.50" bail to prevent cap loss during fueling.
• Markings: "DIESEL ONLY" printed on the cap; underside is plain with no logos or numbers.
• Fit & Replacement: Replacement part numbers MP-2600AC3; compatible with Freightliner quarter-turn systems and other diesel fills. Replaces 3-37017-000, S21361, 600148, 0337017000, 337017000.
• Dimensions: Cap inner bore 3.5"; outer filler neck should be 3" (measure your fill neck before ordering).
• Performance: 220°F thermal relief helps protect the cap in hot vehicle bays.
• Ideal For: Fleets, maintenance shops, and DIY replacements for Freightliner and other heavy trucks requiring a diesel-only, non-vented cap.

Measure your fuel filler before purchase: ensure a 3.5" cap bore with a ~3" outer neck for proper fit and reliable operation.