4" Locking Diesel Fuel Cap For 1972-2017 Peterbilt 330-587 Trucks 11-04859-200

4" Locking Diesel Fuel Cap for Peterbilt

This 4-inch locking diesel fuel cap fits 1972-2017 Peterbilt 330-587 series trucks and cross-references with OEM part number 11-04859-200, providing a secure, vented replacement that deters fuel theft.

Overview

The 4" locking diesel fuel cap for Peterbilt replaces worn or missing caps on Class 6-8 trucks, preventing fuel contamination and siphoning. Its heavy-duty locking mechanism keeps diesel secure on long hauls, and the 4-inch diameter matches the tank neck of Peterbilt 330 through 587 models built from 1972 to 2017. Fleet managers and owner-operators depend on this 4" locking diesel fuel cap to cut fuel loss and meet transport safety standards.

Built For Performance

• Zinc die-cast body withstands UV, road chemicals, and impact without cracking
• Dust-tight seal blocks dirt and moisture from entering the fuel tank
• Two-key locking system prevents casual fuel theft and tampering
• Pressure-relief vent maintains proper tank ventilation during temperature swings
• Large knurled grip allows easy removal even with greasy gloves
• Compatible with standard 4-inch diesel tank necks on Peterbilt trucks from 1972-2017

Fits These Machines

• for Peterbilt 330
• for Peterbilt 335
• for Peterbilt 340
• for Peterbilt 348
• for Peterbilt 357
• for Peterbilt 377
• for Peterbilt 378
• for Peterbilt 379
• for Peterbilt 385
• for Peterbilt 386
• for Peterbilt 388
• for Peterbilt 389
• for Peterbilt 587

On-The-Job Use

• Long-haul overnight parking where fuel theft is a known risk
• Construction sites where machines are often left unattended for days
• Fleet yards wanting a single locking cap solution across mixed Peterbilt rigs
• Replacing a stuck or damaged cap that no longer seals the tank
• Ensuring compliance with DOT fuel cap leak-down tests during inspections

Specs At A Glance

Good To Know

Q: Does this cap fit Peterbilt models with an angled or recessed tank filler neck? A: The cap is designed for flat, standard 4-inch filler necks; slight recess or angling is usually tolerated, but measure your neck depth and clearance before ordering to avoid interference.

Q: What should I do if the locking mechanism becomes stiff over time? A: Apply a dry graphite lubricant into the keyway once a season and rotate the key several times to distribute it; avoid liquid oils that attract dust and gum up the tumbler.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.