4 in Diesel Fuel Cap for Peterbilt Trucks - Durable Aluminum

In this review the focus is on a practical replacement: a pair of 4 in diesel fuel caps made to fit many Peterbilt models. The bottom line is simple: this is a no-frills, robust aluminum cap set for owners who need a direct replacement that resists leaks and simplifies maintenance. The reviewer found the caps straightforward to install, well built from die-cast aluminum, and a sensible choice when an OEM-style non-locking cap is required for trucks from the mid 1990s through 2016.

Key Features

• Compatibility: Fits a wide span of Peterbilt models from 1995 to 2016, ensuring a correct fit for common heavy-duty trucks without modification.
• Direct Replacement: Replaces common OEM part numbers such as 11-04859-100 and 11-04859-200 so mechanics can swap caps without adapting the filler neck.
• Aluminum Construction: Die-cast aluminum alloy body offers durable corrosion resistance and a solid seal that helps prevent fuel leakage under normal service conditions.
• Pressure Release: Built-in pressure release makes replacing the cap and relieving tank pressure easier and reduces the chance of spills during maintenance.
• Complete Kit: Each set includes two 4 in caps, rubber sealing rings and a 13 in safety chain so installation is usually completed without extra parts.

Who It's For

The ideal buyer is a Peterbilt owner or fleet maintainer looking for an affordable, OEM-style non-locking replacement cap for models from 1995 to 2016, including 330, 379, 389, 579 and 587. It suits shops that prefer the durability of die-cast aluminum and need a kit that includes seals and a safety chain for immediate installation.

Owners who need a locking security cap, a different diameter, or a cap for non-Peterbilt filler necks should look elsewhere. Drivers who require electronic or keyed fuel security features will not find those in this non-locking set.

Pros & Cons

Pros

• Solid die-cast aluminum build provides long-term resistance to wear and leaks.
• Comprehensive kit includes seals and a safety chain for quick replacement.
• Wide compatibility with many Peterbilt models avoids fitment guesswork.

Cons

• Non-locking design offers no theft deterrent for fuel caps.

Specifications

Product Type	4 in Diesel Fuel Tank Cap (pair)
Material	Die-cast aluminum alloy
Fitment	Peterbilt models 1995-2016 (330, 379, 389, 579, 587, etc.)
Replaces Part Numbers	11-04859-100, 11-04859-200, 572.1015, 600212
Included Accessories	Rubber sealing rings and 13 in safety chain
Design	Non-locking with pressure release

Our Verdict

This 4 in diesel fuel cap pair is a practical, cost-effective replacement for Peterbilt owners who need a durable, leak-resistant non-locking cap that installs quickly. Given the die-cast aluminum construction, included seals and chain, and broad model compatibility, it represents solid value for routine maintenance and fleet servicing where keyed security is not required.

Frequently Asked Questions

Will this cap fit my Peterbilt 379?
Yes, the cap is listed as compatible with many Peterbilt models including the 379 when the filler neck is 4 in in diameter.

Does the kit include seals and a chain?
Yes, each set includes rubber sealing rings and a 13 in safety chain so you can install the caps without buying extra parts.

Is this a locking fuel cap?
No, this is a non-locking design with a pressure release, so it does not provide keyed security.