Semi Truck Locking Diesel Fuel Tank Cap Cover for Freightliner Western Star 2X

This 2X Semi Truck Locking Diesel Fuel Tank Cap Cover is a set of two locking diesel fuel tank caps compatible with Freightliner and Western Star trucks.

Product Overview

The 2X Semi Truck Locking Diesel Fuel Tank Cap Cover replaces standard fuel caps with two keyed-alike locking caps, keeping your diesel secure from theft and contamination. These heavy-duty locking diesel fuel tank caps thread directly onto the filler neck of most Freightliner and Western Star semi-trucks, providing a tight, tamper-resistant seal. Built for long-haul reliability, these semi-truck locking fuel caps give fleet managers and owner-operators peace of mind at every stop.

Key Features & Performance

• Two-piece set includes both a locking fuel cap and a spare, with matching keys
• Keyed alike design—one key operates both caps for quick, one-handed fueling
• Heavy-duty die-cast metal body resists impacts, vibration, and harsh weather
• Corrosion-resistant chrome finish keeps the cap looking new after years of road use
• Vented cap relieves internal tank pressure without leaking fuel or introducing moisture
• Easy hand-tighten installation—no special tools or modifications required

Fitment & Compatibility

• Freightliner Cascadia, Columbia, and Century models
• Western Star 4900, 5700XE, and 4800 series
• Other Freightliner and Western Star trucks with standard threaded diesel fuel tank necks
• Fits most class 8 semi-truck fuel tanks configured for a screw-on cap

Common Uses

• Securing diesel fuel tanks on long-haul semi-trucks
• Preventing fuel theft at overnight parking areas, rest stops, and depots
• Fleet-wide fuel security for logistics and transportation companies
• Replacing worn, missing, or non-locking fuel caps on heavy-duty trucks

Frequently Asked Questions

Q: Do these caps come with keys? A: Yes, the 2-pack includes two locking fuel caps and two matching keys. Both caps are keyed alike, so a single key operates both.

Q: Will these fit my specific Freightliner or Western Star model? A: These caps are designed to fit standard diesel filler necks found on most Freightliner and Western Star semi-trucks. Always verify your tank’s thread size—commonly 3-1/2" NPT—before ordering.

Product appearance and specifications may vary slightly by batch. Compatibility may vary by serial number. Verify fitment before purchase.