Phoddar Locking Fuel Cap Set for Freightliner 108SD — 2-Pack Die-Cast Aluminium, Keyed-Alike

Built to meet or exceed original-equipment specifications, this Phoddar locking diesel fuel cap kit offers a corrosion-resistant aluminum body, nitrile rubber sealing rings, safety chains, and keyed-alike locks. The package includes two caps, four matching keys, four spare gaskets, and retaining chains—intended for vented semi-truck fuel tanks with a 3" filler tube outer diameter and about a 3.5" inside cap diameter. It’s engineered for high-temperature relief up to 220°F and designed specifically for diesel applications.

Will this cap fit my Freightliner truck?

Compatibility covers many Freightliner models from the mid-1990s through recent years as a direct OE-style replacement for 1/4-turn 4-pin push-and-twist caps. Confirm fit by measuring your fuel filler tube outer diameter and the cap seating area before ordering.

• Designed for a filler tube outer diameter of approximately 3 inches and cap inside diameter near 3.5 inches.
• Direct replacements for Freightliner part numbers including 03-37017-002 and 572.1018, plus equivalents from Velvac and Tectran.
• Compatible models: Cascadia (2008–2018), Columbia (2001–2016), Century (1996–2010), Coronado (2003–2022), M2-112 (2005–2022) and related FL series like 108SD.
• Intended for vented diesel fuel tanks only; caps have no threads and require proper neck dimensions.

How does the Phoddar locking cap protect my fuel system?

The cap’s die-cast aluminum housing and high-quality lock cylinder block dust, water, and corrosive elements while the nitrile rubber seal prevents leaks and maintains an airtight closure. The keyed locks deter unauthorized access and fuel theft, and the included safety chain keeps caps attached during service.

• Heavy-duty aluminum alloy resists corrosion and road damage.
• Nitrile gasket creates a leak-proof seal and withstands diesel and temperature exposure.
• Keyed-alike locks (4 matching keys) reduce theft risk and simplify fleet management.
• Safety chain and bail prevent loss when refueling.

Is installation straightforward and what should I check during fitment?

Installation is a simple remove-and-replace for compatible quarter-turn filler ports, but proper cleaning and inspection of the filler neck are essential for a reliable seal. If you encounter sealing issues, taking photos or a short video of the neck and cap alignment helps troubleshoot fitment with support.

• Clean the fuel port thoroughly before installation to avoid trapped debris.
• Use one rubber gasket per cap; spare gaskets included for future replacement.
• Ensure the fuel tank is the vented type required for 220°F thermal relief.
• Contact seller with images/videos if leaks or fit problems occur for assistance.

Who is this for: Fleet owners, owner-operators, and maintenance technicians who run Freightliner trucks or compatible models and need a durable, keyed replacement for worn or missing quarter-turn diesel fuel caps. This kit is suited for those wanting OEM-style fit, theft protection, and a corrosion-resistant build—especially for long-haul and heavy-use applications where reliable sealing and quick servicing matter.