2 3/8 Locking Diesel Fuel Cap for 02 and Up Freightliner M2 Small Semi Box Trucks

Product Overview

The Locking Diesel Fuel Cap provides a secure, leak-resistant seal for diesel tanks on 2002–up Freightliner M2 trucks. This heavy-duty cap prevents fuel theft and contamination, ensuring reliable operation for fleet and owner-operator vehicles. With a 2 3/8" threaded design, the Locking Diesel Fuel Cap installs directly onto the filler neck of small semi and box truck models.

Key Features & Performance

• Locking cap with key deters fuel theft and siphoning
• Precision 2 3/8" threaded base for secure, rattle-free fit
• Rugged metal and composite construction resists diesel fuel and UV exposure
• Vented design prevents tank vacuum and fuel flow issues
• Includes two keys and built-in dust cover to keep the lock mechanism clean
• Direct replacement for factory caps on 2002 and newer Freightliner M2 trucks

Fitment & Compatibility

• 2002–2025 Freightliner M2 106
• 2002–2025 Freightliner M2 112
• Small semi trucks and box trucks with 2 3/8" diesel filler neck
• Fits OEM diesel tank necks measuring 2 3/8 inches outer diameter

Common Uses

• Securing diesel fuel in fleet trucks to prevent unauthorized access
• Replacing lost or damaged fuel caps on Freightliner M2 box trucks
• Protecting fuel quality during long-term storage or overnight parking
• Owner-operators seeking a theft deterrent for high-value diesel fuel
• Compliance with DOT regulations requiring a secure fuel cap

Technical Specifications

• Cap Diameter: 2 3/8 inches (60.3 mm) thread
• Material: Zinc alloy and reinforced nylon
• Locking Mechanism: Push-on key lock with 2 keys included
• Vent Type: Vented
• Compatible Fuel: Diesel only

Frequently Asked Questions

Q: Will this cap fit my 2005 Freightliner M2 with a 2 3/8" filler neck? A: Yes, this locking diesel fuel cap is designed for 2 3/8" necks on 2002 and newer Freightliner M2 models; always measure your neck to confirm.

Q: Does the cap come with keys? A: Yes, two keys are included; the cap locks by pressing the key into the lock and turning.

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